RE: Tail dragger conversion; Why?
Tail dragging trainers are easier to handle IMHO. The long arm between the rudder and the mains on a trainer reduces the ground loop tendency. What makes warbirds so hard to handle is the short distance to the tail wheel.
I built my original trainer as a tail dragger to save some weight and avoid the cost of a nose wheel (it was a SPAD, so cheap counts), and now any plane I build is a tail dragger.
As others have said, the nosewheels are a real pain on a rough grass field.
Brad