The right build ? My many years of trying and I am still trying for the right build ! lol I have spent a good amount of time messing around with factory built waste oil burners. They have come a long way, but in my opinion, they still need to keep going. The maintenance is unreal, the dependability as a primary source of heat ? I feel is not a wise choice. The best I have ever seen them things run, is on straight diesel. Then your back to the cost so why not burn LPG ? Drip oil systems have there down falls, but I am thinking the Rocket Stove design might be what I have been missing ?