I would say to take a look at some of the 1/12 scale kits. They are designed for combat but many have landing gear option. There are a couple of neat plans available from MAN and RCM. Rich Uravich did a coupla nice 25 size plans. He did a nice extra. Some of the fun fly planes will fly well with that engine. They will not be able to do 3-D tricks. But with control surfaces tamed down will fly real good on a 25.

Mark Shuman