Look closely at photo #2 It appears that the entire fuse is twisted. Looking at the firewall, it appears to have a clockwise twist, ant the empennage appears to have a counter clockwise twist. and obviously the wing saddle needs attention. Does the other aileron have the same problem, or is this just seen on the right side? The ailerons appear to be covered in some kind or semi-rigid plastic, so maybe remove them from the wing and try steaming them and inducing a twist until they are straight? I dunno, this is why I try to avoid all ARF's I had rather correct my own screw-ups than work on Joe Nguen's.