So I recently found a way to make transparent walls and had to put that knowledge to use.
Video:
Screenshots:
Script:
http://pastebin.com/NuS74Zv2How to make transparent walls:
I'm just going to briefly explain so no one has to go trudging through the script. I might make a more detailed post in the map tutorials section but for now just this.
All you do is put down an object from the geometry tab, go to the script, and replace the shape (cuboid, prism, cylinder, etc.) with the shape from one of the transparent objects in the racing tab (startCuboid, endPrism, killCylinder, etc.). For one reason or another making a racing object like this removes its function meaning a killCuboid doesn't kill, checkpointCuboid doesn't set a checkpoint yadda yadda. However, startShapes(the blue ones) retain their solidness. So you can't go through startCuboids but you can hook onto them unlike the other three. Also, If you place two transparent objects directly on top of each other you'll get a mix of their colors. That is how I got the indigo colored walls, one startCuboid and one killCuboid.
And that is it. There are a couple of other things I could explain but this is the important stuff.