Lownslow,
I was looking for the same thing when I found pix, I think, somewhere in this forum, if you do a search youll find some posted here, this fellow did a great job on his 4* and I sent a PM requesting info and heres the response I got, I have copied the pix somewhere, if I can find them Ill go ahead and insert them later.
Anyhow, heres his response.

Roger,
Thanks for all the compliments, you made my face turnRed . The Cowl I used was a Stans fiberglass model GP-216. I installed 1/4" triangle stock on the front sides of the engine mount/firewall plate then cut the stock cheeks of flush to the triangle stock. The cowl was longer than I needed so I trimmed of approx 1 1/4" if I remember right. I am running a Siato150 in the plane so I cut a U shape the engine out of the buttom of the cowl so the cowl can slide around the engine and pitts tubes. The 4* plans call for a 1/8" radius front to back on the top fuselage sides which I did but theis is a tighter radius than the cowls so.... I used my heat gun to slowly warm the top corner radius on the cowl just to the point of the fiberglass becoming soft the quickly slid it on and reformed the cowl around the 1/8" fuselage radius. I did this one side at a time before installing the ultracote covering. I fastened the cowl on with 2 screws on each side ans 1 screw up from the bottom on each side of the U i cut out for engine clearance. If you have never reformed fiberglass go slowly and heat just to the point where in becomes pliable. Don't get the heat gun to close or go past the pliable stage as you will burn the glass and make it brittle.