Modular Fantasy-Railcar for 2G/G/or LGB

Hello folks! i had created this Modular Railcar for my dad. i tried to make it as printable as posible on my 20x20cm anycubic. (but at the moment it prints nothing but lump) and i didn`t have the patience for such big prints
the size is nearly this of some LGB locomotivs. you can make it as short or long as you want.
it is designt so, that in the floor is a space fot electrics and motors. the formely created wheel achsis i had delete cause i don`t know how the have to be connected and there a