Dude, Kal'ika all this work is amazing! I love all the guns! It's honestly hard to pick which I like most, but out of the all varied options you drew out in in the last picture I like the top center rifle the best.
The SMG stock that makes a thumb hole is sweet and gives a nice angled look; the short mag is (in my humble opinion) more in keeping with StarWars power/gas charges/packs, the bigger optics look more useful, esp with the fold down bipod legs for sniping. I particularly like that last feature because it make this gun feel like a universal weapon. With legs up and stock in, it's a close quarters spray-n-pray, with the stock out it's a mid-ranged rifle, and with the legs down it's a sniper.
Hmm, wait, this is your verpine isn't it? I guess I was thinking the ultimate blaster, but then again, you still want it to be a multi-use rifle, so I think it's great, you could go with a long clip then. The more slugs the better right? I think the long clip you have is a bit too long looking though, I'd try one that was the same length as your grip.
Can't wait to see this one come together! Keep up the good work, you're keeping people like Adonian and I, who are to crazy busy with real life to work on our Mandos, entertained and inspired.