This is a balsa rib set to replace the Ace tapered foam wing. Sheet the wings with 1/16″ balsa sheet. It can be fully sheeted, or sheet just the fore and aft portions and use cap strips in the middle. Leading and trailing edge sticks are 1/4″ balsa, spars are 1/8 x 1/4. The ribs are square at the trailing edge, so you’ll need to add 5/16″ balsa trailing edge stock, which can be either an aileron or a fixed trailing edge. It appears that this rib set was designed with the intention that the two wing panels be joined with glass cloth, without a plywood dihedral brace.