Love the helping hands idea. I'm going to make one out of 2x6. For the VTC soldering iron, I would use this instead:
http://www.homedepot.com/h_d1/N-5yc1vZ1x...catalogId=10053

(You cut your cable in half and it just snaps on to any standard dual conductor 120v cable. Little pins pierce the insulation and you snap the cover on)

You could mark on the plastic with a sharpie for the location for each temp you use. I put one on a table lamp. Couldn't be easier.