Thank you for the reply. I am well aware of this solution already. Just like In the OP, I said I need four of them on one board with a USB hub circuit. These will be permanently attached to the host via USB. It is a 68 pin card PCB. I need everything integrated onto the one PCB, not a bunch of headers and cables all over the PCB... Furthermore I may have a lot of flat plane space to work with, but not exactly vertical space... there will be several other cards on either side of this card.
Also, this all has already been "prototyped" on breadboard and whatnot the way you are suggesting. I am ready for the final model and all I have left to build is this card. So again like the OP, is my reverse engineering of the ch340 nano correct? I am well aware as well that I left out the regulator, because I don't need it...