finally I got it. I bought all parts and assemble services from taobao
spec:
Case : NCR G81-3007
PCB : MXALPS-30xx Rev 1.4
Switches : 62g MX clear lubed + stickers
Full LED
Keycaps : classic G80-3000 beige keycaps
Cable : black coil PS/2 cable
case (picture from taobao seller)
PCB (picture from photekq)
Keycaps (picture from taobao seller)
cable (picture from gilan)
assembled keyboard:
In case you didn't notice, there is a small defect in the assembled keyboard (from the above pictures). I may fix it later.
The PCB is not perfect, I can not directly use the PS/2 cable but instead I have to use the green PS/2 to USB adapter.
Ken