Quarry Helix How To This is an N Scale quarry helix. The design was adapted from Ted Brandon's article in the July/August 1990 issue of N Scale Magazine. Basically, we built three 4' x 4' frames out of 2x3s, and fastened them to four 2x3 legs. One frame is on the floor, one at the height of the first level and one at the height of the second level.