I'm building a 2'x2', 3 floor parking garage for my son. I've built the core structure out of 1/2" plywood, with dowels supporting it, and 3/16" chalkboard-paper lined plywood glued on top of the plywood on each level (for eventually allowing parking spots to be drawn on and such). The levels are about 6" apart.
I created two cut-outs for the ramps (ie, cut out about a 8"x3" section, both to leave room for the ramp and to be used for the ramp itself), but I'm working out now how to attach them properly. What would be the best way in terms of surviving a three or four year old's level of play to attach them while still keeping it looking more or less like a parking garage?
My thoughts were either a hinge (like a door hinge) to attach to the top level and a smaller hinge on the bottom level, or to use a wooden triangle to screw it to. The angle will be about 30 degrees or so (yes, probably unrealistic, but it seems about to match what other products use). Is there a better option? What should I keep in mind while doing this?