Yes.

What kit are you thinking of converting? The larger kits make decent conversions, but the smaller kits are too small and built too heavily to take the extra weight of a power system and radio. A friend of mine built a 21" span Piper Cherokee with GWS Pico gear. Came out at 3.4 ounces, for a wing loading of something like 30oz per square foot. On something that tiny, 10oz per square foot is heavy...

Depending on the kit you get, you may need to cut all the parts out of lightweight balsa. Guillows has a reputation for cutting their kits out of rock-hard heavy "balsa."