Entity Calle Fallberg spoke thus:

> my Vanagon came with a Masonite board screwed down to the floor both on
> top of the engine and on the passenger floor
I can tell you why, to even out the corrugations. You lay on a mattress on
top of the engine lid and those damn corrugations hurt!

I made a flat floor and deck lid with Coroplast, a common signmaking
material:
http://coroplast.com/graphic.htm

It's a lot of work cutting strips and gluing though, but my floors are flat.

-- Gnarlie