Hello,
I couldnt made any mods to the HB-F5 because I have not anything in what base it, no service manual, no hardware reference, and before try things that may affect hb-f5 rather leave it like this.
Perhaps this may sound a little crazy, but as I see, my HB-F9s case is a bit crappy, then i checked the HB-F5 case and is an almost perfect, besides that the case is the same than HB-F9s (removing small differences), I have tried placing the hb-f9s components in housing HB-f5 and matches perfect, then I raise the exchange housings but there is a big problem, the most important difference between this two computers is the Keyboard, put the HB-F5 case into HB-F9s hardware is possible but the HB-F9s keyboard does not match where the HB-F5 keyboard is placed, there is important differences between the keyboards. Then the big question will be if There Is a chance to use the HB-F5 keyboard conected to the HB-F9s motherbard, i saw that both keyboards have same number of keyboard pins "1 to 24" in keyboard motherboard.
I suppose that some changes in Hb-F9s roms will be also needed, to be able run the HB-F5 Japanese Keyboard, but the most important thing is to know if this "exchange keyboard" will be possible or not. I mean that maybe more HB-F5 hardware parts are needed (or the HB-F5 hardware keyboard is much hardware different to run with HB-F9s motherboard) to make possible this exchange, besides code hb-f9s roms changes and rewiring hb-f5 keyboard motherboard.
Anyways if anyone could help me will be great, because this way i could use the completly Hb-F5 case into the modded HB-F9s.
HB-F5 keyboard:

HB-F9S keyboard:

PD: The numeric and direction control pads, located in the right not are showed, because are the same thing in both computers.
Regards.

