Move the main gear mount so that the axles are at least in line with the leading edge of the wing, or SLIGHTLY forward of that.
For the tailwheel, just add a plywood mount to the back of the fuse, mount your tailwheel and connect to the rudder if the rudder is behind and below the elevator.or, if the rudder is above the stab, use a cable pull/pull set up from the rudder servo.