Brent
Epoxy and paint are probably the easiest and quickest route to a uniform headliner (sans holes). I like the idea of a cedar headliner and I've toyed with the idea myself for #113. It's hard to say if the cabin will seem too small and dark or if it will become a little more cozy and warm. The big question would be is your headliner delaminated from the outside shell? That fiberglass-core-fiberglass 'sandwich' integrity is important for strength and although I'm sure there are some ariels out there sailing around with delaminated cabintops if you're doing the work you might as well do it right. Maybe one of the Commander owners would know if their cabin tops have a heavier laminate schedule than the Ariels because they lack the headliner. If not, and the laminate schedules are the same, maybe some well tabed firring (?) strips would be all the support needed for the exterior shell. I'll be watching to see what you do and when you do post lots of pictures!

P.S. for S. Airing- if and when I can figure out how to post pics you can bet I will.