So... some wheels and holes were made.

RIMG1124.JPG

perspective isn't right here, it actually is about 31.5cm diameter.
you can also see how i made them:
Roughly sawn out the wheels (took a big frying pan to sketch around).
Drilled a 5mm hole in the middle and through my "table" (big cardboard box with a wooden plate on it. not enough space for a real workbench there).
put a screw (M5) through it, to fix everything. used this small wooden block also screwed in the table to stabilize the jigsaw, and tried to hold it as steady as possible against it while turning the wheels with the other hand.

Might not be perfect, but well... hopefully good enough.

Did have some trouble pressing in the nuts to fit them on the gearbox shafts, since i don't own a drill bit with 14.5mm diameter. And no normal drill bit above 11mm diameter fits in the drill. next bigger would be one of these wood drills with a flat head, but that would be 16mm and way too big.
So.... used the 11mm one, a hot air gun and (because i seem unable to find where put my hammer, and having my small anvil at work and not at home) hammered it against the floor with a big monkey wrench.
Let's just say: it is in now. somehow. need to look at it again and straighten things up. Maybe even get a useful drill bit before i try it with the second wheel.

I also tried to put in the Ali tube, but again: no fitting drill bit.
Could have gone 20 or 25mm to fit the 23.5mm tube through. Tried to do it with the 20 and some force, but didn't work.
Maybe should have started with a bigger hole and try to fill it up a bit afterwards, since the 25mm drill is no ordinary one, but one of these flat headed ones for wood. Hard to enlarge an already existing hole with that.

Ah well... 5 more days to go. let's see if that is possible for such a noob^^