The cowl Herr gives you is really light, and goes together well if you are careful.

Cut some extra strips about 1/4" wide from the plastic sheet, hold them in place with clips, clothespins work great, and make a flange around the inside of the front of the cowl. Use slow ca, fast ca will make the plastic crack.

Fasten the other two pieces together at the top, also using a backing strip. then tape everything together and test fit it. Once you get a good fit around the front you can glue most of it together.

Heres mine