That's great to hear! I'm really, really looking forward to this thing.
Might be fun with 2 Mercs on one side, 1 artemis on top (near the pilot), and an artemis/gatling combo on the other side. If you're far enough away from trouble, you might be able to have 2 mercs and 2 artemis firing at the same time.
It would definitely be a lot weaker at close range, but gatlings are pretty good. =]
The side guns are each off 45° from the front. For guns from opposite sides to get in arc with each other, the combined arc has to be 90°. The merc has 20° in either direction, and the Artemis 64°. It's impossible to get both in arc at long range.
I've got a few builds in mind for sniping. There's the brawler/sniper with a focus on brawling (two mercs, front gat, gatflak), brawler/sniper with sniper focus (two mercs, front Artemis, gatflak), and the brawler/sniper + utility (one merc front or side, Artemis front or side, mine launcher, gatflak).