Marauder would be such a good name.
To get the cannon as central as possible (for accuracy and rate of roll) I deliberately mounted the undercarriage to a pipe around the barrel fixed to the front spar. You got the length early as that is needed for the Meredith cooling anyway. I can shorten the tail height.Perfectgeneral, That is really good, to be perfect it needs two rows of exhaust pipes and the inboard cannon will need to move outside of the undercarriage.
This image does conjour up exactly what I had in mind For the first MB4 prototype. The second and third prototypes would be completed with the extra half panel of length in the after fuesalage and the larger vertical tail as in the later OTL MB5 to cure the latteral stability problems.
...the Corsair's initial deficiencies were being worked out on a concurrent basis... The 689th production F4U-1 featured a number of significant changes. The most noticeable was that the cockpit was raised 18 centimeters (7.1 inches) to improve the pilot's forward view, and a bulged canopy, along the lines of the "Malcolm Hood" used on Spitfires, replaced the original "birdcage" framed canopy to provide better all-round field of view.