Guillow kits are a great source for canopies, cowlings, and decals if you're building to the same scale, and many of them are practically free on ebay. The Guillow Mustang has a 27 inch span btw--the 109 is 24 inch--they are both scaled to 3/4 inch to the foot.

What's an SWR? Sheet Wing Racer? Must have missed something in this forum.

Jim