ORIGINAL: silverdev1l

I have a 1/4 Scale Taylorcraft 110" wingspan,the plane has no wing tube and is only held on by a single bolt with 2 small wood dowels near LE and TE to keep the wing lined up.I am planning on recovering the plane this winter and when I have the covering off I neeed to repair some structure,I would like to add a wing tube for strength and was wondering if anyone has some tips on how to do this,ie adding structure in wings ect...
Also the plane has had some damage and been repaired by the previous owner and I am not sure the stab is at the right pitch(I have to add down Elevator to keep the plane from climbing,Is there a way of finding out what angle the Stab needs to be?