Outstanding!
Is that a bash or is it something an idiot-finger-gluing-to-the-mech knucklehead like me could put together?
It's easy, actually. The B used to be sold as an IWM online exclusive, but I think you can get all of the parts from the Omnimech parts section now. It's a standard Summoner's legs and torso, a narc launcher part on top in place of the usual drum launcher, an arm for each side with an SRM-4 rack in place of the hand, and then there's LRM-20 parts that fit over the top of the shoulder assemblies. Very easy to do- I've done two now and had no problems with them whatsoever, despite having pretty much zero skill working on miniatures myself.