Last night I made the front fender thingy, the rounded part that protrudes inside the car and allows the wheels to turn. So I have one less hole in the floor now!
Started with a brake cleaner bottle:
Fits almost directly! Needed to trim the hole just a little bit. Also the can has some kind of plastic coating inside, I burnt it off with the torch, also burnt the paint and it was all very easy to buff off the remains after that.
Then the real work started:
Held in place with a clip:
And soldered (I drilled two holes for M2 screws to hold it in place secure while soldering, then removed the screws):
Clears the small wheels good:
And clears the larger wheels just fine too!
All in all still ugly soldering but it seems to hold good, and I might put some JB weld when all done before painting to hide whatever is not nice enough.