Yeah, except that a lot of screwy stuff like that really worked.
They had Cubs taking off and landing on LST's in WW2 hanging off of wire trolleys.
Heavy fighters and medium bombers landing on arrested decks in WW2 within 250-300 feet. DH Mosquito trials, and at least one incident of B-25 bomber departures (unfortunately no arrivals

)
The nuke-armed AJ-1 Savage landed on deck spaces about as large as that drawing, without the uphill tilt.
C-130 carrier tests were somewhat successful, and they even put a U-2 on and off a carrier deck.
Compare that drawing with the hillside strip that the Just Aircraft factory has... not much different at all.
Heck there are fixed wing airplanes that can land on a decent size helipad (I did it once myself in a glider but it was a larger than average helipad), and there has been talk of tiltrotor executive transports with rooftop pads ever since the proposed Bell 609.
It's definitely sci-fi, and the economics would probably not be viable... but mechanically it's within the capability of existing engineering.