"Can't touch this"? Well, I know a mech who can. Deadly over all distances with 3 large lasers, but feels most comfortable in brawling distance with 1 LB 10-X AC, 1 SRM6 and 3 medium lasers. The heat is very manageable (59% in brawling mode w/o the LLs vs. 56% in lasersniping mode) with 16 DHS, and ammo will only run out in prolonged battles. With the 350XL you're relatively nimble and you have a shieldarm, if the going gets rough. If you feel the need for an AMS, you'll need to drop 1 LL and upgrade the reactor to a XL365 or a XL370. This would be the survivalist's version for standard reactors, I dropped one LL and added (almost) full armor and an AMS. The speed will be okayish, mastered at 62.9 kph - heat management however still very good with 16 DHS, so I went for ER-LLs here. Obvious
I really like your Build with such a huge dmg output!! But the Heatmanagement could be better if you want to use the Large Laser in close combat too. Furthermore I like to have a bit more speed, so here is the slightly different version I would go for. Maybe ERLS are better I have to try out.
This Mech is really something else, let me tell you. This has made my BLR-1G an absolute blast to play. I'm getting more and more disgruntled with the XL engine, but that's due to my propensity to brawl. I might downgrade to the Standard, but that one less Large Laser hurts... Tough choice. But I really feel like this Mech makes the most out of the available hardpoints for some real punishment, and I love it. 4/5 stars, only due to my XL frustrations.