James,
I've done several 4 stars 60's and 120's. They are great as kitted, but the last one that I did (120) I modified by adding semi-eliptical wing tips, and did the tail feathers kinda-sorta like an extra 300 (bigger and lotsa throw) While it didn't turn the 120 into a 3-d plane, it sure did wake it up for aerobatics. It is still flying in the Nashville TN area. The pushrod suggestion is well worth the effort.