The Bridi Stik is a BIG plane requiring a 90-120 engine. Pretty big investment and leap for a first plane.

Since you have some building experience I agree with Chuck on checking with the plan services. Save the time of making drawings that may be of an unairworthy plane. Go with a proven product at least for the first one. And try to stick to a .40 size engine up to a .60 maximum. Keeps the plane size within reason and the costs.