My preferance is four strokes. Glad you went that way. The power will make up the for the weight. I'm puting an OS 72 on mine. I didn't state the first Extra 300S I built was my third plane. It lands somewhat faster than a trainer or a stick. Fly it to the ground, it does not float. Your build and covering looks like a pro did it. You should feel proud. You did great work. I question the flying wires becasue the stock pushrods are 2-56 and should be 4-40. The first one I had Was destroyed because I stalled it in a rolling circle over trees after 4 years of abuse. I will upgrade the pushrods again. good luck