I am wanting to convert a sig 4 star 40 into a twin . Can anyone help me?

Do a search in this and thetwin engine forum. There are a bunch of threads for bashing a single to a twin.

William, I started one of these but have not completed it. I have used the nacelles and nose cone (inverted ) from a Hobbico twin star. You need to put strength back into the wing. I was intending to put a piper style tail and fin on it. There is not much ground clearance for props i.e 9" maximum. If I was starting a new build I would make it a trike u/c. Also mine would be electric. I am not sure of the wing strength for i/c motors. I hope the pics might be a help toyou.
Chris UK.