Sorry for the late reply.This looks fantastic, and it's just the kind of thing I was trying to imagine in my head. I wasn't sure whether it would be possible to have everything connected to the sit-stand desk, so that everything goes up and down together, but it looks like you have achieved that? Are your two secondary computer monitors on arms which are connected to the sit-stand desk? I would love to put together something like this - may I ask for some specs for what you have here? The frame, desk top, any other hardware (how did you put together the drawer system for the keyboard?).
Many thanks @stigc56
I used a table frame from Fully: Jarvis Frame - Black - Wide - MidRange - Programmable.
The table was made of wood, what we here in Denmark calls MDF 1800 x 1000 x 28 mm.
The 2 ball bearing guides was mounted to the frame with 3 bolts on each side.
Finally the keyboard "drawer" was made of 2 aluminium squares fixed with screws to the bearings. You will also need some kind of stabilisator BETWEEN the 2 squares, on the downside, to keep the keyboard from wobbling when you pull out the drawer. I choose to fix my Yamaha S90es with screws to the two squares. I will supply my drawings in short time.