Well, in repairing the tail, make sure you jig it up as straight as possible. You can use some plywood inserts to strengthen the area. On the wing areas, sand the edges and apply a silkspan patch (if you can some) or possibly silk material. Build up some substrate with clear dope and filler coat then use sandpaper to blend it into the surrounding area and repaint. But a lot of that depends on what was used in the original finish. For instance, if Aerogloss was used, there is almost nothing compatible with that. If Sig or similar dope, then it's pretty easy. And you will have to figure out what original colors were used to match what is there.
I have a Cobra in much the same shape and I'm trying to decide if it is worth fixing.