The XP-69 was the Republic follow-on to the P-47. The twin engines were mounted aft of the pilot, as in the P-63. It was massive by WWII standards. I'm using a 1/48th scale Mustang and a 1/48th scale Thunderbolt as parts for this 1/72nd scale project.

The 1/48th scale Mustang fuselage next to the 1/72nd scale drawing of the P-69.

Though it looks like a single engine plane, the P-69 is a twin engine aircraft with both engines buried in the fuselage.