I know the purists will not like it..
My 55 first series was modified when I got her. I decided to gut the interior. This included adding a rear gas tank.
The dome light swich was fubared, so I wired it to a door jamb switches, also built a floor to dash console. Console has separate gauges stereo, speakers and courtesy lights, that work with the door jamb switches. LMC sells an interior courtesy light fader in which I incorporated. The two large holes where the gauges were, are now an Autometer Speedo and Tach. The speedo bezel is pre-drilled for LED turn signal and highbeam indicators.
What "out of the box" mods have you made to your ride?