I thought I shared the frankinstax I made on here a couple years ago but I can't find the post.
I made it using a Polaroid 101a and a belair instax wide back along with some 3d printed parts I designed so I wouldn't have to chop off the sides of the camera like most of the other ones with this combo, the original version used a 95a but I wanted some more manual controls so I upgraded it.
The back had to be upside down to fit properly so all of the pictures are also upside down and focal and shutter are all vibes based since the film sits farther back than the original but the film is half the price of shooting with one of my Polaroids so I'm fine with it
These are some older shots the light leak has been fixed since then I just haven't really gotten the chance to shoot it anywhere recently