Johnny,
I have not driven a car with a light dash, but I haven't seen too many done that way and assume it is for the reason you mention. Easy enough to see what the impact will be — just lay some light fabric on it and see how bad the glare is.
PIM sold a really nice Mangusta a few years back done similarly (although in reverse) to what you describe and it sure looks great. They did use a darker tone on the top, which might be a good idea. Photo from the PIM website.
Please post pics of the outcome.
Cheers,
Mark
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