The missile pods are a nice touch for this, however, the flamethrower is not necessarily a good idea, at least not for a main anti-infantry system. I'd go with something along the lines of a 25mm cannon, but again, this is your transport. The troop transport module doesn't seem like it would be able to fit many soldiers; perhaps a hexagon shaped module would work? Other than that, this is a rather well thought out VTOL heavy gunship design.
Ah, my bad. I looked at the roles there on the sheet and based my comment on that. For a supply ship, this makes fairly good sense, if only because most infantry units don't want napalm raining down from the sky onto their heads.