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After reading this thread I'm starting to realize my Mopar Performance bolt-in frame connectors are useless. 
Would they be ok if I have a friend weld them in, or do they really need to come up through the floor?
They're not useless, but they fall short of what your goal is with them. They don't need to come through the floor, but that would be the ultimate way to stiffen the floor section. Welding them in at each end would be a good idea, and will help a lot. From there, tying them to the floor somehow, mid-span is a good idea.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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