I recently received this from someone who was a long time developer at Konami. Enjoy the shots. It came with the appropriate cables and what looks like an interface card for the PC-98. Happy to entertain offers.
According to the contact, this originally cost 2.5 million yen and was connected to a host PC (either a PC-9801 or Sony proprietary Unix workstation). This is the EP-ROM version where as there is a cheaper kit which ditched this functionality. It does work as a normal SFC with the usual multi out on the back and controller ports on the front of the machine. (There was an SF BOX that was used before the SFC's release.)