Along with my VSF Steam Generated Zappy Gun, I also completed one of HaT's Colonial Gatling Guns.
Andy is currently flocking it for me, as he did my tank and as he is doing with my Steam Zappy Gun.
I attached it on a 60mm by 40mm DBx base, and will use it as a Shooter for HOTT, or as a, well, Gatling Gun for G.A.S.L.I.G.H.T., or what ever VSF skirmish rules I decide to use.
G.A.S.L.I.G.H.T. is D20 (of which I only have four), and unit-card-activation-based, which is just another (minor) thing to sort out...still, they appear a bit simpler than the Space 1899 Soldier's Companion that I'm considering as an alternative, and these reports that I have just found here do look rather cool...so...