I would love to have a B128...it would act as a test platform for a new unix-like operating system a few friends and I are creating. Right now, my testing is limited to VICE and my 128D that currently isn't hooked up...
Along with that, it would be nice to have an IEEE-488 drive to go along with it...the SFD-1001 comes to mind.
I think the B is the best looking PC chassis ever produced and given the way of the world, it make not be long before there is no-one else even trying to produce a great looking chassis.
I have several B's, including one I had shipped in from a bankrupt fish factory in Norway, but I would not part with any of them.
Hopefully you can find the parts you are looking for.