Bachus,
Very nice keybed...BUT $1,000!
But you are right about being able to stack the T5 on to the lower. I had the PA2XPRO (long gone) on top of this CME 76 and it was very close and worked out very nicely.
It needs to be very close to suit me (I am an X organ player)
I will be adding something some day either on top or on the bottom of the CME 75 UF keyboard I have now. Probably on the top as I want more MIDI switches etc.

Thanks for sharing the A-88.