I always like room to work and also to see my work so i think i would try to get everything out of my way to make sure everything i glue in is glued in very strong. I dont own any balsa arfs except one and it has no blocks for the control horns to be screwed in . I will make ply control horns with a long tail and glue it to the side of ply rib they had in . It was a American made ARF so i cant even B%&ch China out :-( lol joe