I've been trying to find a good loadout to make my founders C1 viable, and I found one (well, two similar builds around the same idea) that has been getting me fairly good results.
SRM4:
http://mwo.smurfy-ne...22e592d4ea1ebe9
SRM6:
http://mwo.smurfy-ne...b895619cf29a0e9
It's not exactly a pure brawler, it's taking advantage of the ERPPC versatility and putting on some SRMs for close-up spread damage. I'm not entirely convinced either direction for 4s versus 6s, but I just started with the build and getting back to MWO in general, so it'll take some time for the cream to rise. As usual I see no disadvantage for putting XLs on Cats beyond the critical slot usage.
There's also some fiddling that can be done with the lasers, I usually prefer mediums but mpls have their advantages. The only problem is the weapon spread requires more groups than I can assign directly to my mouse. I always separate PPCs, so the other 2 are just all the lasers and all the missiles respectively. This means it runs hot--especially so with the mpls--but I've been getting around 400-500 damage on good matches, 600+ if I get some lucky ammo explosions.
Tactics for it are generally to make use of its speed, get to a good snipe spot and harrass with those ERs, then fall back and join the main battle group to give their lights a hard time while taking on the enemy line with your lasers and ERs. The obvious cons are that you're in a catapult, so by the time the lines converge for true brawling, your nose has generally taken quite a beating. But, if you're good about fading in and out, making sure the enemy isn't focusing on you too much you can clean up nicely. Spiders, however, are such a pain (you have no idea) if you're like me and haven't used SRMs extensively before. I think I've taken them down more with lasers and the PPCs than with the SRMs.
The nice thing about it is that it's pretty unexpected, I haven't seen a build like it before personally (But I've also been away for a while, so maybe this build has already been tried and scrapped). Not that I'm the first to put PPCs on a C1, but it's generally to make an LRM sniper for both direct and indirect support. It doesn't seem to work well for me in that configuration, I tried LRM10s but the differences between positioning for direct vs indirect makes it really just not do either to great effect. Better to just make it dangerous close up, with the option of some long-range pain because snipe battles are so common right now. It's also very maneuverable for a Cat, 2 JJs will get you up most normal terrain lickety-split and provide some quick repositioning options that the K2 sorely lacks.
Thus, I'm dubbing this the "Variable Brawler" build for the C1, since it also relies on a variety of weapon types.