Good info so far. A camera port doesn't automatically rule out floats, just adds 337 / FA work to the project. It also adds a little bitt of weight to the project.
I have only flown the Horton on a late model plane, that is fairly heavy. I wouldn't buy one over a Sportsman, but I wouldn't walk away from a plane that already had one. I also doubt I'd add
any cuff on top of another. I am just not a big fan of having dead unremoveable weight (the old cuff) buried into the plane, nor am I a big fan of swiss cheesing my leading edge. I am sure it works out just groovy for most folks, it's just a personal preference. If I was hell bent on a Sportsman, I'd just exercise patience and find an early virgin wing (non Cessna camber) or one that was converted to Sportsman from this point. This would yeild the lightest Sportsman wing attainable. Worse case example would be a Cessna cuff, (early to late model upgrade) upgraded to a Horton, then covered by a Sportsman. That's 4 leading edges! but the average Joe just doesn't add all those little things up!
On the weight note, I would buy the airframe that fits your needs, and then worry about making
*your* airplane light. Early models are not automatically lighter, they can just be made to be that way. They also have a smaller gross/useful. There are plenty of early models that are pigs, and conversely, lately I have run into
185s that are lighter than the average 'early model' 180. Never the less it is possible to have a 1550#, '53-'54, big engined / big wheeled, C-180, and it isn't with the later ships. If you like any creature comforts at all 1650# is a more realistic target, with another 100 to 150 pounds for the later ship. 100-150 pounds is not all that bad when you consider the added benefits if they better fit your mission. For me they don't...
There are those that say they fly their 180's around heavy all the time, so keeping the plane's empty weight light is not a big consideration

I don't get that concept. If I flew at gross++ all the time I'd want a lighter empty weight even more so.
Are you two shipping or trading out of the cub? If so you should come get this FAD baggage, for your cub, it will be worth more, and then you'll have an excuse to try out a 180 or two and compare virtues

We are balls to the walls right now 'till mid Dec. but it doesn't take much arm twisting to get me to fly.
Take care, Rob