Bob; yes it should be versatile. The hard part will be to decide to adjust the nozzles, the restriction, the restriction height, or wood size. My old one was flared many times along with a second gasifier I had built and I kept switch things, mostly nozzles, until the one gave the best gas. That one went in the truck.
I am no longer a fan of preheat. My present preheater weighs about 100 lb and I am out to put the truck on a diet, so the preheat is going. It was made out of about 15 ft of 3" exhaust pipe formed and covered with 4" pipe to make a counter flow heat exchanger.
I had a shop roll me a new cyclone filter so of course I will use that. Thinking about a bag filter and a box around the bag and cyclone for heating the gas going up to the engine. Key word--- thinking.
The bars are spaced 3/8 th's apart. I am going for more ash and less char. No room for slip char so this may be problematic. My old grate was 3/8 th rebar spaced about 3/8 apart and it worked although there was a little room for slip char. TomC