Is there a reason why you are looking at the Surface Book rather than a Surface Pro 4? The Surface Pro 4 should be sufficient for the various scenarios, and there are various VESA mounts available. http://www.amazon.com/Surface-Acrylic-POS-Security-Enclosure/dp/B00LHRABTK is one such example, and then you can go from VESA to whatever mount you need (such as DAESSY). On our setups we use a custom acrylic and 3d-printed case and a DAESSY mount system. One way to power the surface is to install an inverter on the chair to get a standard 120V outlet, then run the surface power brick off of that.

The main difference between the Surface Book and the Surface Pro 4 in this scenario, if I am understanding the usage correctly, is the physical keyboard. Since the Surface Pro 4 has a keyboard cover and can support whatever USB keyboard you want, I think its probably a better solution.

From: xxxxxx@alsa.simplelists.com [mailto:xxxxxx@alsa.simplelists.com] On Behalf Of Lisa Bruening
Sent: Tuesday, February 2, 2016 11:01 AM
To: xxxxxx@alsa.simplelists.com
Subject: wheelchair mounting system for Surface book