By wooden signs, do you mean the information itself is engraved or stamped into the surface of the wood, or would you include signs with wooden posts and frames, but possibly some other material for the printed "sheet" with numbers, etc.?
If the latter, take a look at East Roswell Park's tee signs, which are constructed of wood, with the information engraved in a metal sheet.
You could use whatever material you like in place of the metal sheet. Oregon Park in Marietta, Ga., has used the same kind of frame with sheets of laminated paper. Instead of the necessary rivets that were used to fasten the metal sheets to the frames at ERP, the laminated paper sheets can be glued or stapled down, allowing them to be replaced more easily. The down side of paper is that it is less durable than metal or other materials, and most likely less attractive (notice the reflected glare on the laminated sheet). For a "sturdier" alternative, you could probably add a sheet of plexiglass over the paper sheet.
These were built by dgcr member Craigd, who could probably share more details on their cost and construction.
opcorn:
