Bob H - thank you kindly.
The wood grain was achieved by creating a mask from sheet styrene, based on this product:
http://www.ultracast.ca/products/RB_Productions/Tools_Scratch-Building/RB-T036/default.htm
5 strips were cut and then shimmied at the ends and center, all glued with a small drop of liquid cement. Surprisingly, the shim in the center did not block the paint spray, so I might try placing four next time I have to make one of these. Being sheet plastic, it is pretty flimsy.
regards,
Jack