Helpful Inexpensive Mods

Dirt cheap: Amazon.com "car cigarette lighter" USB charger with voltage display. Infinitely cheaper and easier then installing "aircraft grade" USB ports and volt meter.

Relatively cheap: TAF spin on oil filter adapter. Easier to deal with than the oil screen, better for the engine, and adds a little passive oil cooling without fuss.

Cheap in the glass cockpit world: Garmin Aera 660 + GDL 50. About $1500 gets you maps and info, GPS nav, weather, ADS-B traffic, and a pretty solid AI with synthetic vision.

The Vernon Gregory old man assist handles.
No longer need to carry step stool.