You can give the framework a light coat of sanding sealer, which will serve to close the pores in the wood. Make sure to sand lightly with 600 grit wet or dry (dry) after the sealer cures. Remove all lumps and bumps. You can actually mix flour and water to form a thin paste, and attach the tissue with this. Use a small artists brush so that you don't get too much of the paste on the tissue. After the paste has cured, a light mist of water will make the tissue shrink. Do not force dry the tissue, since this will cause puckers near the attachment areas. I was doing this back in the late 40's and early 50's. It's fun.

Bill, AMA 4720
WACO Brotherhood #1