I would love to run SGP on RPi, but for now I'm using it on Intel Compute Sticks.
I have one attached with velcro on each of my scopes. They are super lightweight and cost under $150. They have two USB ports, so I use one for my imaging camera and one for the guider.
I am trying to control my mounts and focusers via wifi, and then I will have a nice clean control system that rides on and and rotates with the scope.
All interaction with SGP and the Windows happens via Remote Desktop, which works great either from a laptop, an iPad, my desktop inside the house, or even my phone.