As we builders advance in age, so the models advance in construction. My first "hollow log" was back in the fifties. Back then they had airfoiled balsa wings...of which I ALMOST sanded the mill marks off the balsa (smooth huh!) One or two coats of clear (barely sanded to get the brush hair off), then one or two of color.
The fuselage got similar treatment. Hollow? It's already hollow. Smooth the rough spots, double cement the firewall on with gauze, drill a hole to accept the firewall of my Space Bug Junior...held on with "Perfect" wood screws.
They were heavy by today's standards but still better than plastic ARFs (except the TD-1, which was beyond my price range). Balsa flies better!
We hand launched them, and the grass landings were the typical 1/2A flair out and bounce...flipping a couple of times.
BUT THEY WERE FUN!