i've made banked turns on one of my tracks ( the rally one) and i did it a little differently, i really like your idea(with a few slight changes) mine are made out of cardboard and you just cut a really flat 'u' and slap that on a turn, then your banked turn has a bit more slope to it and its a bit less rigorous for design, mine work great ( my 350Z goes fast enough to ride off the banking walls and its at least a 45 degree angle at the top.... i love em you can tear into the corners and fly into a straightaway absolutely wicked)the supports you have under the turn i couldnt really tell but are they perfect right triangles? if they are you should curve the hypotenuse of the the triangle so your turn has more (at least a little curve to it) or maybe that was what you were going for(just a thought if you'd like it ) i'm gonna go copy your layout now for my next track do you mind