Master clutch cylinder access hole

I recently had to remove the round cover that plugs the hole for the clutch master cylinder mounting, on my 92LX which has an automatic transmission. I wanted to run two heavy wires into the car for an ammeter, and the best place to run it was via that hole. To get the cover plate off I first removed the driver's seat - turning it upside down onto the passenger seat. Then with a chunk of plywood I could lie on my back, my feet on the rear seat backrest, and reach the upper nut, one of two that holds that cover plate in place. The other nut is reached from the engine side, with the battery out of the way. I cut a hole in the cover plate, made up a thick grommet to protect the wires that would run through it, and put it back. I disconnected the wire that runs from the positive battery terminal to the main fuse block next to the air cleaner. I connected my two wires in series with that wire and the input to the 100 amp fuse; and have my ammeter function. I also ran eight extra smaller gauge wires for other future instruments I want to watch; the rad fan coming on, the injectors firing, an electric oil pressure gauge, the pulsing of the Idle Air Control Valve, etc.
All this took more than a week, with the interruptions of fixing/maintaining cars belonging to other members of the family - and recovering from the spasms in my back from working under their cars.