What to use for ceiling panels?

[austinado16]

I'm back working on the '87 Starcraft Nova that I repaired the front roof structure in about a month ago.  Time to do something with the inside ceiling panels that were water damaged and have bubbling and delaminating white vinyl and the thin wood (Luan?)behind that is also rotted in some areas.

My thought was to just go right over the existing ceiling with 1/8" sheets of FRP, but I can only get it in a pebble texture that looks lame.  Found 1/8" sheets of smooth white board that you'd use for bathroom walls (Arbitibi?) and bought 3 of them, but it sure feels heavy.  

I figure once these 4x8 sheets are cut down to 3.8x6.5, plus umpteen tubes of construction adheasive, it might add 50lbs. Too heavy to be adding to the weight of the roof?

Is there a better material?

[munchkin]

we used --watersealed on 1 side and kilzed and latex painted on the other==beadboard. same fear--but husband said it was fine. we'll see.

[chrismarques]

I used prefinished panels from Lowe's. They are 1/8 masonite with a white marbled finish. They seemed very heavy at first but not too bad to raise the roof. My Viking has spring arms so I have to lift the roof without a crank and they don't seem too bad to me.