http://www.the-conclave.co.uk/forum/index.php?topic=2717.0Here's the parts combo in question.
The "turrets" are actually a pair of "xenos"or archeotech mini frigates that came with the old Rogue Trader ship pack for BattleFleet Gothic.
They make for good twin-linked lasguns!
The bits holding up the shoulder cannons are a pair of K2 PPC arms for the K2 Catapult from Mechwarrior Online - sculpts can be found in a number of places, including warhansa.
The left arm is - IIRC - from an Orion of some sort, same source.
The alteration to his gun is also from an MWO-style battlemech mini, possibly a timberwolf gun piece
This chap also exists:
http://www.the-conclave.co.uk/forum/index.php?topic=2763.0Once again, those shoulder guns are catapult K2 guns.
The left arm (with a spacer carved off something, possibly a Guard mortar) is from a random Battletech mech, produced by Iron Wind Metals - sadly I can't quite recall which one specifically.
The rest of the parts after that are all obvious 54mm =][= bits.
Again, I don't own the mini anymore.
I drastically cut down my collection after a certain point, so I now have about 3 or four 3-person warbands, and a number of space marines (largely for display, unless we ever do another Marine focused game again).