Maybe some 1/4 ply with ribs to keep it from flexing, and if you like it glass it with white pigment in the resin. Couple of fill coats and sanding and it would match up nicely.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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