Haven't built the Academy Corsair......yet. But, if it's as good as the Tamiya offering, then simply gluing the gears shut should be the fix. An easy way to make sure that they line up correctly when you glue them is to stuff the gear wells with some tissue paper (to keep the gear doors from falling into the empty cavity) before you glue the doors in place. That should work for the tail wheel doors, too. Make sure you add a pilot in the cockpit (the canopy can still be opened or closed). Also, a blurred prop would be ok; or, you could add an electric motor and a battery to spin the prop.
If the kit's gear doors don't line up too well, you might need to resort to some plastic surgery with some plastic card and make your own gear doors. Good Luck on it!
Devil Dawg
On The Bench: Tamiya 1/32nd Mitsubishi A6M5 Model 52 Zeke For Japanese Group Build
Build one at a time? Hah! That'll be the day!!