That's amazing -- I think I can understand most of what you described. Especially liked the P&R part of it. It's like you have blocks of things of different sizes that could be arbitrarily placed on a checkerboard (or maybe a Go board is more fitting). And each one has hundreds of different length spaghetti wires coming off, that need to be connected to every other block. How do you start arranging them -- it could be infinite possibilities, but you have to start with initial guesses and do some kind of minimization and see the lowest "cost" solution that meets your needs. Repeat.

Thanks!