That's my plan. I'm going to put a forty gallon behind the rear seat and build it in...add heaters, fuel pressure gauge, fuel temp gauge, and tank toggle switch. Most people recommend not starting on veggie oil or shutting down on it...just starting on diesel and then switching over when veggie is up to temperature (I think 180 or so).
Costs a little more in the end with extra fuel lines, tank, install, heaters, etc...but (as I live in Chicago) is necessary to running effectively without tons of problems. I will probably be doing this next summer as I want to get all of the engine up to snuff before dropping extra cash in. Saves some serious money even if you don't collect yourself. I can get it $1/gallon dewatered and filtered to 5 microns. Not bad compared to $4 a gallon for diesel in the city on a cheap day.
I too would love to hear about any set ups others have that are actually running and not thoughts in their head.