high quality heavy 18650s weigh about 2 oz. 190 of them would weigh about 24 lbs. Throw in another 6-10 lbs for bms, wiring, casing and errata and it's not that bad.

I would be more worried charging that huge home built battery pack. I'm sure OP knows what he's doing, but I wouldn't want to bet my house on it.

Bikes typically have a weight rating. Mine has 150lbs of cargo capacity (is a cargo bike).

There's significantly more variation in weight between riders. If you're under the frame's weight limit, including battery, you're fine.

That's why at https://infinite-battery.com we designed a fireproof and waterproof casing for our repairable batteries