Ideas for Universe Wreckers/ Help with Whirl?

Okay, I'm currently working on (along with 7 other customs) Univese Roadbuster. Repainting Universe Onslaught and moding it with Star Wars POTF Snowspeeder blaster poles to beef up his caliber. I should be done in a few days and I'm already thinking about Whirl and I have a question. Would E Shockblasts head work on E Bulkheads body? I don't mean looks, I mean proper size and still transformable?
I just found Omega666's Twintwist (already started a Topspin from Skyblast a while ago), so between that and Fanprojects Broadside and Springer, who's left?
Any thoughts?
I just found Omega666's Twintwist (already started a Topspin from Skyblast a while ago), so between that and Fanprojects Broadside and Springer, who's left?
Any thoughts?