RE: CD ScaleDesigns Albatros CI build
The ply doublers have been glued on with a strategic combination of Titebond, CA, and epoxy. I used Titebond on the varnished former sides, CA around the bottom to make a quick bond to set the location, and epoxy up front were it can't be seen and were the strength is really needed. I needed to add a small bit of triangle stock to the rear of the F1 former to have something to glue the doubler to.
Note: Before gluing on the panels I files the chambers/bevels onto the sides of former F2. I didn't do the bevel on F1 until after the double was in place and then I could just sand it down to the line of the side wall. Finally, I haven't epoxied in the front of the right hand side ply doubler because must of this will have to be cut away to accommodate the engine cylinder.