Hay R/C ART,
I have a good quality ply on the bottom of the stab, glued in, for protection of the balsa stab...but I glued the upper light ply to the upper floor of the fuselage aft where the balsa stab will go up against. I realize now that I could have glued this light ply to the top of the stab...but I do hope mine works ok. If I suspect I will have a problem with the top of the stab, where it goes up against the fuselage aft floor, I will glue on a 1/64" plywood piece for this section.
I am going to install the full stab and rudder this morning and take a few pictures, then I will remove the tail feathers and cover them with Super Monokote.
By the way...would you post a few pictures of your PB4Y1. I've a Jack Stanford B24 I purchased from Jack...30+ years ago with the intension of making it a PB4Y1. Jack sent me the instructions on how to modify his kit and sold me extra .50 cal. guns and blisters for the conversion. I've never gotten around to build the kit...but its up in with my other kits.
Soft Landings Always,
Bobby of Maui
