Squeak,
I just receveid a personal message from James Woodcock (Administrator of Yamahapkowner.com):

"Just read your post on Synthzone, the keyboard is not Yamaha or any model for that matter, its a 3D model a friend created so we can rotate and use it wherever we need it. It is based losely on the PSR-3000 but it is unique I suppose."
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.