Mock ups for the win!
I had the benefit of already owning an x-arcade tankstick when designing my upright cab.
I experimented with various control panel heights, monitor heights, & monitor angles.
My cab is as it should be....for me.
I also dealt with the issue of having enough CP below the buttons to rest your palm.
It's one of the things that determined the depth of my CP.
I can see where that would be a tougher issue with a bartop.
I'm not sure about the one you linked without knowing the actual depth of the control panel.
The CP on my full size cab is 9" front to back IIRC, but the buttons are pushed back a bit farther.
Any shorter and my palms would be on the edge of the CP.
If the front edge of the CP were rounded, it probably wouldn't be an issue.
You're talking about two people trying to use a miniaturized machine simultaneously.
There probably isn't going to be a way to get optimal ergonomics.
If you made it one player with a front porch, then maybe.