Then it was on to gluing the cross grain balsa to the bottom aft of F3. I left off the top for now as I will be mounting the elevator servos outside. the fuse. I will need to add hardwood for the mounting rails inside. I am also going to set up pull-pull on the rudder and am still thinking about where the servo will be located. I may make an access hatch between F4 and F5 and stick it in there.
I also pinned in the firewall with 1/8 inch dowel. There is NO WAY that is coming apart unless it gets help from dumb-thumbs and terra firma!

Red.