I have tried a few but none of them seem to look right. So I turn to the crowd for help.

I've seen someone use string and hang the machine gun from the roof just inside the doorway. That's the way I remember Vietnam era machine guns being mounted on Hueys.

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Of course that's just my opinion, I could be wrong.

I would try using a gatling gun instead of a regular machine gun. Take some plastic that is thin and narrow for a mount and judge the size of the plastic that looks best. Cut the narrow plastic to your "realistic" specifications and paint olive drab. The size of your mount will be trial and error. Use different size plastic to judge. Then super glue your gatling to the mount facing outside. this would be a fixed mount. For a swivel mount, cannabalize the main m-60 mount on the Seal tactical jeep. order two from small joes, their 7.95 a piece. Then cut the tripod mount, judge the correct height, then glue.

alternatively get a maurader inc minigun

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Arguing on the internet is like competing in the special Olympics - You may win, but you are still retarded