.. When drilling, back up the .001 metal with something much thicker of brass or aluminum, this will help prevent the metal from distorting due to the pressure of drilling.
How about making a tight sandwich with the thick stock above and below the thin stock to minimize burrs when drilling?
I'm not a pinhole photographer but became interested in making one after seeing the work of Barbara Ess in here book I Am Not This Body. The unsharp images were the best, IMO, very surreal and interesting compositions.
"Pictures are not incidental frills to a text; they are essences of our distinctive way of knowing." Stephen J. Gould