I know that Ron Hogervorst and Klass Jan de Langen in the 90s were working on very low voltage amplifiers. I don't know if they went as low as 1V, but if I was you, I would check their work
I don't think you are going to get 50dB with a FC structure and badly biased cascodes. Since the BW is small, the solution is to go for 2 stages.
If you still can't get 50dB with 2 stages, you may have to go 3 stages, but that's probably too much for 16MHz and it complicates your stability too much
I mostly agree with PaloAlto, but I still think you could be able to do it if your output swing is less then 220mV (single ended). Maybe not over PVT though...