Veggie tip #1: Don't think about converting until you collect at least 200 gallons--AND you have the ability to collect 200 more.
#2: figure out where you're gonna store 200 gallons of oil.
#3: if you haven't got shot by your wife/gf/neighbors by having 200 gallons of oil around, now you may begin.
Where do you plan on taking the bus? If I lived in Tampa, I'd just dump it in the tank-25% diesel 75% veg. (7.3's are really forgiving)
If you plan on 2 tanking, and are staying in the south, i wouldn't worry much about heating the veg tank. Its only got to be able to flow up as far your heated filter.
The nice thing about buying a kit, you get tech support--and the abilty to ask questions of a known unit. (This is the path I took. I had 80k on my VW Jetta with a Greasecar kit before I did my bus.)
Not trying to sound discouraging--but its a serious undertaking that needs to be thought thru well.