Simrad Robertson...hydraulically assisted auto pilots rather tha screw driven. Responsive and interfaces just fine with Raymarine stuff.
Solar question. Is quite well discussed on the thread you noted.
How much room do you have. No refrigeration to soak up amps? No SSB?? What are your DAILY average amphour needs?? That is where to start. See my chart on the original thread to calculate. No one can advise anything meaningful with the data you've given.