I ended up going through the spare grommet intended for the speedo cable IF I were to go to a manual tranny...just added 3' more length than I wanted.
I'm not putting in anything crazy...Just a new head unit (actually a great older one I pulled out of my boat), replaced all 6 speakers w\ 2 ohm Infinities, routing new speaker wires back to the trunk, planning on a JL Audio 6-channel amp to power all speakers, pre-wiring for add-on sub & amp if needed.
I started with replacing the speakers first, sounded OK but not great...Replaced the head unit & by-passed the puny amp...but the 2 pair 2ohm speakers on the front channel caused an over heat issue on the head unit. While I had more door panels off, I'm re-building the power window motors & adjusting all the windows. Fixed the saggy map pockets. Pulled the seats out & now just going for it while the car is in for the winter.
The previous owner lived on a dirt road...he didn't drive it much but Holy **** there is dirt everywhere under carpet, etc. So I'm takin my time & cleaning it up too. It's nice doing audio work in a convertible with the top down & the seats out .