Bit of a necro, but the Battletech computer game gave us another Atlas II variant and the House Arano sourcebook gave us a tabletop record sheet for it: the AS7-D-HT.
Take the stock Atlas II, drop the LB10-X and 3 DHS, then use the tonnage to add an AC/20. Stick that in the Right Torso, move all the missiles to the Left Torso, stick the MPLs in the Center Torso, and put one of the ER Large Lasers in the Right Arm.
Personally, I'm unimpressed. The stock Atlas II didn't really have enough heatsinks as it was. Losing three just makes things that much harder on it.