20cc four stroke RC engine

this was my first model in solidworks based on Nemitt's design of a single cylinder 10cc engine from model-engineer magazine. I thought it would be nice to redesign it as a twin. In retrospect maybe I should have changed the angle from 90 to 75 or 60 degrees to shorten the timing belt. Maybe even a flat twin, just needs a new crankcase, a longer nose to use a double belt, parts are there in anyone wants a go at it. Might even have a go myself time permitting. Have added a render to give you the idea of what a flat twin would look like.