I think ggray has the right approach if you want a hard surface. However for a headliner
you need to find some sort of rubber material -- a hard material applied with a texture roller could result in scuffed and scraped scalps for the crew when conditions are rough.
If you're looking for a high finish level you could build a headliner
made of a variety of materials. Plastic or thin wood panels
held to furring strips, or you can buy foam-backed vinyl and apply it to thin plywood panels
using 3M spray adhesive
, and put it up in sections with the covering wrapped around the edge of each section.
Another approach is to use heavy woven felt material that looks like gray burlap, only much softer, and apply with spray adhesive
. This is used by Corsair
trimarans and the owners refer to it jokingly as "mouse fur". If you search the Farrier F-boat forums
for mousefur or "mouse fur" you will find discussions and that could lead you to a supply source.
The advantages to mouse fur or padded headliners are they will be softer if you bump your head
and they will also help deaden sound.