This is my mech that will do the jobs my others mechs don't want to do. Alpha the snubs and medium lasers, throw in the MRM's if your target is visible enough. When you're hot (always), spew MRM's like candy to keep yourself entertained. Firing group 1 - Snubs, firing group 2 - mediums, firing group 3 - MRM's. Since neither Smurfy nor MechDB have the 7D in their databases, here are screenshots:
Looks like a monster! MRMs are a nice touch, would be difficult to spend the tonnage/slots otherwise (standard engine perhaps).
A standard engine's possible, maybe, but I think the 57kph is already needed to get the meat of your weapons in range. But zombie potential... tempting to give this a try.