Hello Mr. Crowe .
I don't have much experience with the tractors but I am trying to learn . I am in the process of building a gasifier for a 40 horse power tractor and trying to keep it small and compact but it is complicated . I think it will work out OK but need some hours on it before before recommending anyone going this route .
Ron Lemler ( this thread ) has built a very nice tractor but it is a large tractor and gasifier and is side mounted so he can operate his front end loader .
Arvid . Olson has built a nice John deere with I think the same motor as you tractor . You may get some pointers from him.
http://driveonwood.com/forum/1463 He may be willing to build a gasifier for your tractor .
It being a small tractor you might even consider going the charcoal route to keep it simple and compact
I a few weeks I may be in a position to give more accurate advise after hopefully operating mine . The gasifier we have been using on the trucks is a two part apparatus. The gasifier with an heat exchager mounted to the side . It seems to work well in the bed of trucks but just not sure if mounted on a tractor blocking some of the field of view. . .