The SF-335 is a light fighter aircraft. Canard design with forward placement of engine and twin tail. Armed by one 30 mm cannon and 3 12,7 mm machinegun. Also can carry two 250 kg airbomb and 4 rockets air to ground.
It looks cool but I must agree with those who worry about getting it balanced.
If you switch places between engine and cockpit - and want to keep the prop in front - you'll have an engineering challenge to get the drive shaft past the pilot while keeping the fuselage sleek. You'd probably have to relocate the guns too.
A pusher would be simpler ... just make sure to give the pilot an ejection seat. Then you'd have a lot of room to put interesting weaponry, or something, in the nose
Though even with the forward tailplane, the aircraft would still be very nose heavy. If you mounted the engine in the rear with a drive shaft forward like on a P-39, it'd be more balanced. Great drawing and design though!