DIY garage for 3D printing and wood-crafting hobbyists.
What you need is plywood 4mm thick for decks and 15mm thick for pillars.
Wall model has 10mm length - measure how much would you need and scale it in length before slicing. From my experience, walls shrink after cooling so add extra 1-2% to measured length. If walls will fit to loos or too hard on the decks again use scaling in your slicer to adjust printout.
Top ramp has "built in" little supports. Remove them before assembling with plywood ramp part.
Because ramps have fixed angle you need a specific length and height of the garage side (see attached pictures). Width of the plywood ramp is 50mm. To define your own garage size do the maths OR print top and bottom ramp parts and assemble with precut plywood ramp then measure resulting height and width of the deck.
Glue everything with some cyanoacrylate (Super Glue). I used little screws but I think it is not necessary. For plywood parts (decks and pillars) wood glue would do the job.