@Jim, thanks for all the info.
I also had all the fittings on one piece of paper and found that laser cutting was much more expensive than I thought. I startet the same process on Sunday last weekend but unfortunately the result was not very convincing. I tried to cut as much as possible using tin snips, because the hacksaw was making much more noise than I thought, unfortunately I don't have a basement and I don't wanna stress test my friendly neighbors to much. Maybe after all that, I will think about laser cut again.
Anyway, I hope this problem will be solved once we have found a new house.
When I first started thinking about a fuselage from stainless steel tubes, actually after I visited the Piper museum in Lock Haven in October last year,
I did some research in the internet and also found the supercubproject site. I got all the drawings and started to transfer some of them into my CAD programm.
Then I did my own plans, took them to Staples and got them printed their in full size. I used them to make a jig, and therefore I got two identical sides of the fuselage.
Than I did another jig, to make the transition from "two dimensional into three dimensional", which was not so easy.
I made a kind of jig also for the landing gear, however I screwed it up. Next time I will follow your hint.
I ordered some 1/4" 4130 steel tubing, which arrived today. Now I am waiting for the Bronze-Nickel brazing rod, which I have ordered from Aufhauser Co. in NY. I hope to get everything together before the weekend.
There are a couple of videos on Youtube with an Aeroworks SuperCub (same size as mine) and this engine, seems to work fine, the only downside might be that the engine does not fit complete under the cowling.