This is the build I will be playing as soon as I'm off work this afternoon. Toyed around a bit on the test server and it seems solid. Clan ERLs provide some long range firepower and light mech leg cutting, the dual UAC20's will hammer anyone who gets close and the range on the clan streaks make them very effective and should help fend of light mechs. 8 tons of ammo might prove to be to much, but I seem to go through it very very fast. I would rather have to much ammo then squeeze in a couple mediums.
http://mwo.smurfy-net.de/mechlab#i=171&l=cf94d69243a3573099f8eaec2e7efc8123dce7bd Took off a ton of armor, 1 ton of ammo, and the targeting computer then added 3 heat sinks.