The XP-68 would have been an up-engined version of the XP-54 Swoose Goose. This is also the Execuform kit.
1. Bubble canopy with an ejection seat
2. A heavy nose armament of 4 x 50 cal and 4 x 20mm replacing the clumsy, aimable nose of the XP-54.
3. Additional cooling vents for the enclosed engine.
4. Counter rotating props
5. Drop tanks
6. Fin fillets