Respecting my earlier post, which I think was about #11 in this thread, I got a PM from MTV essentially calling me out on my comments about the Robertson STOL--and he's right. I have no personal experience with it, only what I've read. He on the other hand has all kinds of experience with it and likes it. Different strokes for different folks.
However, I stand by what else I said in that post. Learn to really fly your old 172, well. At 120 hours, it's a good bet that you're not really as proficient as you will be with specific practice regarding short fields. Few new pilots are. When you can touch down where you want to, 10 out of 10 times in a row, and consistently make your approaches at the same relatively slow airspeed, then you'll see how well that old airplane can perform, landing. You will find that you can consistently get down and stopped from your touchdown point in around 600', if your approach speed is correct, with a light load (2 normal size people, half tanks). It takes a bit longer to take off with the same load, about 800', but again it takes consistent practice--same flap settings, same airspeed, same load. All that's in your airplane's flight manual. Without any obstacles, your proposed 1200' airstrip will work--and then if you want to take a full load, fly over to a nearby airport with longer runways to load up.
Here's a little story that illustrates what I'm saying. My first airplane, back in 1975, was a Skylane in a 3 person partnership. Over time, it became a 2 person partnership. My remaining pard was a doc, and he liked making "house calls" to patients that lived in the hinterlands with their own ranch strips. Then he also got the speed bug, and although I couldn't afford it, we traded the Skylane in on a new TR182 right after Cessna started making them. Within a few weeks, he wanted to have a Robertson STOL kit installed, which he told me would have been $26,000 in 1979 money--that's about the equivalent of $87,000 in today's money. I was having hard enough time meeting my part of the financial obligations on the airplane, so I balked--why should we spend that kind of money? It was because he wanted to take the airplane into those ranch strips, and the TR182 was "too fast"--he couldn't make the first turn off of 21 at Laramie, which is about 1500' down the runway.
http://155.178.201.160/d-tpp/1707/00225AD.PDFI should interject here that he had a hard time accepting any piloting advice I would offer. Although by then I was a CFII with several students, and he was an instrument rated private pilot, it seemed a bit like trying to teach my brother something--there's a reason why teaching family isn't often successful. I suspect part of it was that when we bought the old Skylane, we were both fairly new private pilots, and I just progressed faster than he did, because I had more time to devote to training. But our friendship was as equals, and that may have been what made it hard for him to accept any of my suggestions. Who knows?
I had flown with him many times in the old Skylane, and he had no problem making that turn off. But in the new one, even with heavy braking, he couldn't--because he was flying final way too fast. He had somehow convinced himself that because the new airplane cruised much faster than the old one, he needed to land it faster, too, and he thought that adding the RSTOL kit would solve that problem. So I suggested that he just slow down--it's just a Skylane with folding feet. I offered to show him what I meant, so we scheduled a time the next day.
In the meanwhile, I cheated a little. I took the airplane out and practiced at different approach speeds. I discovered that with a light load, just me and 3/4 tanks, I could easily and safely approach at 55 knots. Much slower, and the nose would drop on touchdown, even with a very soft touchdown. So the next day, we went up, and I asked him to do a landing so I could watch what he was doing. His final was at 80 knots--way too fast--and there was no way he was going to get stopped as short as he wanted to. We went back up, left the pattern, climbed up to about 10,500' or so (something more than 3000' AGL) and I asked him to do some slow flight. His idea of slow flight was a whole lot faster than mine, so I asked him to slow it so that the stall warning buzzer stayed on all the time and the IAS barely moving. He did, but he was obviously uncomfortable. Then I asked him to do some turns, and he did them with little bitty banks. I asked him to do them with 30 degree banks, and he said, "NO! It'll fall out of the sky!" When I insisted, he told me to do it--so I did, and although I could feel the burbling of an imminent stall, it didn't stall--it didn't fall out of the sky.
Then we went back to the airport, and I suggested that now that he knew it wouldn't fall out of the sky at very slow airspeeds, he should slow the airplane down on final. He made the approach at 75 knots, and again, couldn't get stopped by the turn off. I said that he should slow it to 60 knots, and he refused: "It'll fall out of the sky!" "No it won't!" "OK, you do it!" But when I came around and slowed to 60 knots, he said, "You're going to kill us!" But we landed, we didn't die, and we easily made the turn off with only a little braking. "Now you try it."
On the next one, he did slow to just under 70 knots, and with moderately heavy braking, we turned off at the taxiway. We didn't buy the Robertson STOL kit--or any STOL kit. He still approached at a higher speed than I did, but it was slow enough to do the job, and he was very consistent about where he touched down. The point is that if airplanes are flown the way that they are designed to be flown, at the airspeeds in the flight manual and consistently, they'll often perform at a much higher level than if the pilot is inconsistent about what he/she does. That's my recommendation to you.
Cary