Firstly I suck at naming mechs. I've been trying to figure out what to do with my thunderbolts for a while now. I think I have finally settled on the build below. It is an out and out brawler, utilizing the stock engine which makes this a good entry level build if CBills are tight. It also means a side torso loss won't kill you. Also it uses all available slots for those of you that like that in your loadouts, I know I do lol. I'm stuck in London and can't play MWO at the moment, so expect more builds to pop up during the course of the evening
I've been looking for quirky ideas on the TDR-5S as well, since I get a C-bill bonus with it, and I've so enjoyed the post-quirk 5SS. While the OP specifically mentions trying to scrimp on C-bills, I really think it deserves some tinkering. There's 20 free slots, enough to add Endo-Steel, worth another 3 tons. Also, the specific quirks apply to LLas, not LPL, so I think I'll try that first. And, despite the expense, I'd use the saved tonnage to add a couple more DHS and a beefier engine.