Cool thread! Used the whole night to read up on the diystompboxes-thread. Lotsa nice work.
Here`s some nice guides linked to in the thread:
http://diy-guitar-effects.tumblr.com/etching
https://dl.dropboxusercontent.com/u/3565959/%5BTutorial%5D%20Making%20a%20Multicolor%20Etching.pdf
Just have to get a laser-printer, and I`ll give it a go. Seems NaOh is easier available here in Oslo, and being that it seems to cut cleaner (and that you can dispose of it in the sink) will probably make me try that first.