A Vintage Pattern Ship!!!
 

Measure 25% back from the LE at the root and at the tip. Connect those points and measure halfway out on each wing. connect those two points. That line is your 25% MAC line.

A 25% MAC CG will fly and be safe with just about anything except a flying wing. You can always move the CG back if the plane needs it due to sluggish performance or poor knife-edge flight.

Its awfully hard to move the CG back after take-off when its too far aft. A plane with too far forward CG flys hot and sluggish (high stall speed and poor elevator response) A plane with CG too far aft flies once and becomes toothpicks. (sometimes they do a loop on lift-off... straight into the ground before you can respond...)

Phoenix 7
 

Pick up your RCM, check address for Don Lowe and contact him. He was designer.