Glad to hear about your first run.
Animal fat runs good to, just have to keep it warmer. No problem with KFC oil not enough to worry about.
Leave the diesel tank up front, locate another one close to the back for alt fuel.
I like the fuel line in the insulated heater hose, and heated filter method best. In really cold climates an added flat plate heat exchanger just before the fuel pump boosts the temp great.
There is some good links to pictures some posts back, google WVO and you will get alot more.
Pickup truck motorized 6 way fuel selector valve from JC Whitney will help your switchover. Mount it in an insulated box with the flat plate HE to work in really cold weather.