Hi Tony!
Well it can be a little brittle but if you pre drilled the holes 1st you should be right. In the Aust Chev CMPs the sheeting was held in place with fold over tabs. If I was doing it I would also use use a product like "Sikaflex" as a form of glue to help it keep inplace.
Oh just as a word of warning dont be tempted to use any realy old "fibro" say at least pre mid 80's as the older it gets the greater the chance it will contain asbestos and it will also be breaking down with age.
Phil...
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collection includes:-
Chev "BLITZ's" (CMP's)
Inc:- No.8 FGT, C8A HUW, C15, No.9 GCT (sold)
Milt Land Rovers 
Inc:- 58 "gun buggy", 60 FFW, 70 FFW, 71 10 seater Wgn, 69 GS.
M3 Stuart Light Tank "hybrid" 
FV1600 Humber FFW/cargo
Mk1 Ferret scout car (waiting restoration)
Various trailers
Inc:- K38, "Ben Hur" 1 ton, 200 Gal "Humber" water tank Tlr, Aust jeep, Landrover recovery.
Milt Radios
etc etc... 
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