I replied here:
http://www.truefresco.com/dcforum/DCForumID1/256.html

in addition, welding has to be done by specialists in the metal shop.

so if your panel is around 24X24 then you dont need metal frame. you can use marine plywood and staple chicken wire to it and build the plaster on that. You can also attach wooden frame to it prior to plastering, just tape it (frame) out when plastering, this way it wont get dirty.

for smaller sizes - ceramic tiles of 12X12, 16X16 and 18X18 is all you need.