You are really on the path to an MFD, not just moving existing standalone screens. Regardless, if you move stuff, you may want to consider life under a single 12-inch (or 16-inch) MFD.
MFD and A/P controls are stuff you interact with a bunch during operation, so it makes sense to have them within reach. Engine controls....not so much. You need visual check but no need to 'touch' them. As an out-of-box idea, move engine controls and gauges overhead into a decent box. That opens-up your dashboard for all the toys your heart desires. Not a cheap ordeal.
Look forward to updates on how you decide to proceed. Sounds like a fun project.
1970 Willard 36 Sedan Trawler