I seem to be getting a bit of a konversion bug... maybe it's my inner Mek coming through
I'd say that's a real good thing! Kinda like finding zen, or achieving enlightenment. Find and express that inner Mek, the only downside is you'll have a bunch of amazing unique individual models that will take up some space, and maybe a slightly lighter bank account. Small price to pay if you ask me.
I admit Cheesy that I'm not sure what you mean by "minigun style" but you still have a pretty awesome KMB Mek, hopefully when the new dex comes out there will be a Mekboy Mob option similar to Nobz, I know I'd dig that, it'd be a great excuse to konvert up a bunch. (Of course if I ever get off my laurels and finish my IA8 army I'd have to build at least 2-3 Mekboyz anyway)
I've found a dremmel tool to be real handy with plastic... You can carve away very precisely... You might be able to use a shoota arm and a choppa other arm to make it happen...
The Dremmel is a new addition to my toolbelt, and I gotta second adam's enthusiasm for it. Personally I'm not using it much on GW grey, but it really eats it up very quickly and easily. Shockingly quick and easy. I'm certainly never going to take the hacksaw to the PVC pipe I've been using in my scratchbuilds ever again. With the saw, it was a 1-3 hour process, with the Dremmel it's 15 minutes or less, that's a BIG difference. Sure you loose the percision that a saw paired with a miterbox, but it's a wothwhile tradeoff if you make sure to mark off specifically where you want to cut. I also haven't injured myself with the Dremmel yet *knocks furiously on wood* it's the only tool I haven't, and frankly I'd like to keep it that way, I really don't want to know what it can do to my fingers.