I have long waited for the day that someone would manufacture a combo controller, but with 88 weighted on the bottom, and 76 plastic on the top...

But the main thing is to be able to get the manuals as close together as they are on organs. It is very hard to make accurate jumps from one keyboard to the next when they have to be physically separated so far vertically, because all the controls for the lower keyboard are above the keybed and the top keyboard obscures them.

They could even make it in two snap together parts for easier transport... Dual sets of sliders for the top keyboard to control each separately, some pads like the Fantoms for drum sounds and loops, maybe a nice big Kurzweil-style touch strip....

I'd pay good money for one of those...