As far as avionics, does anyone have advice as to where to start for designing electrical schematics? I have some manuals Ive been reading through, but man it is tough to decipher them when I dont have the physical product(s) sitting in front of me.

Start with the basics, i.e. the aircraft electrical system. Battery, starter, alternator etc. Next radios and lighting, Then move to the EFIS/autopilot.

Congrats on the Series 5 score. I built from a 5 project and they fly just as nice as a shiny new 7.
Check the wall thickness on your spars. if they are .050' your gross wt will be 1420, if .060, then 1550. Your build manual should have the details.