If you want to build a dehydrator, a suitably built wooden box with a 4" PC fan, and a 40 watt incandecent appliance bulb should do the trick.
But then again, will it be worth it? I'm not sure how much I'd trust a dehydrator dryed finish- or more accurately, I'm not sure how much I'd trust it to speed up drying/outgassing time so that I could polish it out sooner.
That's when I usually build the engine/interior/underside, etc.