If I do build one, it'll be a smaller one as you said. I can't buy used parts from abroad because my dad says they can't pass through customs. Additionally, it either costs a lot from multiple shippings, or it's a single one and I have to hope parts will fit. I'll see if I find a local solution (MDF and tubes like like peu said), or drop it. I really don't get how I'm gonna get the bearings though (maybe it wont use any)
Now I better start reading a book to understand the plans... someday...
EDIT: WAAAIT... we can buy used things of this kind... it's used legos that he doesn't know how to get through...
