Question about dragster mode.

[BobFungus]

Basically, I'm wondering how to set up the starting boxes and the red->yellow->green lights. I'm fairly new to the editor, so could somebody explain it to me? I also noticed the ropes/pistons/whatever for the moving blocks are bound to the center of an upper invsible block, yet when I go into the rope editor, I can only set the ropes to the corners of blocks.