The gas tank and front cover are hard to find and usually are expensive if you do, but you know that already. I had parts left over from restoring a 1936. The 36 is not a common motor from what I can tell. Only 1890 only were manufactured and it seems few survive. After repairing it I didn’t want to risk denting the tanks so I built this motor from the left over parts to see how they ran. One coil tested good. You should know that more likely than not these coils will be bad. Check the coils secondaries, if you find one, to be sure they are not open. If they’re not open, but the coil insulation is cracked, consider buying it, if its cheep enough. I fill the cracks with liquid tape on mine, as new ones run $125.00 on up. This worked on this motor. I tried to get it to run right several times a day for almost three weeks. Although the motor started easily, it ran like crap. I could never get the mixture right. When I would lean the motor out, because it was too rich, I was lucky to get it to run a full minuet before it would lean backfire. The 2 clips in this video was as long as I could get it to run before it would start to backfire. I should have saved some of that video. The motor seemed to run fine in my barrel but I spent much of my summer trying to get it to run right without any luck. Try to get the magneto first. You can fab some mounts for a more common gas tank to find out how your motor runs before you put a lot on money into it. Gas tank mounts are just aluminum angle. Video link – https://www.youtube.com/watch?v=KpRqmS2C3N4
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.