For your cowl molding you may want to cover the plug with some of that bad lining matterial and wb poly. Then smear some vasaline on it as a mold release before your glassing procedure. This would save having to carve out the pink foam. Some guys spray with Pam as a mold release.

If you pm me your address I'll send your a scrap of Koverall that you can use to compare to the dress lining at JoAnn's. Another point - The Sunline comes in colors someofwhich are dark enough to eliminate the need to paint. I bought some dark blue for my Beaver wing.