Thumpalumpacus
Lieutenant Colonel
problem with most of the Defiant "Mods" is that you keep pretty much the same external shape and then change just about everything underneath the skin.
Due to the weight of the turret and crewman the plane was considerably heavier than a Hurricane. This was so the plane could pull nearly the same Gs at the greater weight.
Simply pulling the turret and crewman out an plating over the hole leaves you with a plane that is several hundred pounds heavier than it needs to be for the job/s you are trying to do.
You can go back and change the size of a lot of the structural components to get the weight down but it is not fast or easy.
Not sure what the Defiant brings to the table over the Hurricane. Same ventral radiator, same simple flaps, similar landing gear that meets in the middle of the plane preventing the carriage of a center line bomb or fuel tank.
I was thinking, and am welcoming corrections, that aside from reducing weight from removing the turret and ancillary equipment, you'd also lose weight from shrinking the wing and perhaps the fuselage? Wouldn't that add something -- speed, climb-rate, or turning?