Regarding keeping twill straight.
The idea of gluing thin fiberglass to back side is interesting. I’ve never had the need but would something like Airtac 2 do the trick? I know guys use this stuff for infusion. Does it work with both epoxies and polyesters? I’m also wondering if the adhesive would cause wet-out issues for wet layup vacuum bagging applications.
BTW – cool project thanks for sharing!