here's a crank forward adaptation of a folder. The hinge was broken so I just welded it shut. Welded 2 pieces of 1/2" x 1" tube where a platform sits and where this old bin sits.
Also welded another bottom bracket shell about 5" forward for a more cruiser type ride
The crank forward design on this bike as well as use of a LWB recumbent are the only things that has resolved groin numbness. The cruiser folder is not as comfy as the bent but easier to wheel into an apartment via an elevator.