Occasionally older airplanes get new panels. Has anyone tried to
build a "glass cockpit" in an older GA airplane? How successful were
you, and what was the biggest stumbling block (paperwork, money, etc?)

In real life I fly a Cessna 150, so it will be a while before I get
the whole Garmin 1000/Avidyne 500C installed. I'm just curious what's
possible and legal.

-Thanks