Nice.
My FPIII is stock aside from running 6SN7's instead of the 12AU7's. Still works great aside from some occasional "static" when turning the attenuators. Rotating them back and forth through a couple of cycles works it out for a while so I haven't found the need to replace them yet. At any rate, I just didn't want to lose the cool, purple glowing OD3 so never bought the extended upgrade.
Like your FPIII. Very cool.