I used both the Saito 56 and OS 70 in mine. The Saito was excellent and the OS flew it even faster! Used a 14" prop to get some blade area outside that big cowl.

The 72 would be a great choice. There is tons of volume inside the fuse, so the battery pack can be moved around to achieve proper balance without adding extra weight.

With a 2 stroke, you would need a pitts muffler to clear the firewall.