It is your car and you can do what you like to it, but if the car is that original then its a shame to lose that originality - you can never get originality back - a restored car is not original. A change of colour is also a big job to do properly, especially with the metal dash, insides of the doors, under bonnet area etc. and if you leave those white then it won't look right.
If you really do want to change the colour then the next best thing is an original period VW colour. There are some really nice 'old' shades to choose from. If you go for a modern colour, like a pearl or deep metallic then it will start to look like a custom bug. There's nothing wrong with that if those are the cars you like, but you'll probably want to get into changing the wheels, lowering & accessories in order for the whole car to look right, otherwise it sometimes ends up looking like half the job is done.
The 12v conversion won't alter the look of the car and as Larry said - thats an acceptable safety upgrade.
The most important thing though, is that YOU are happy with your car.
Rob Amos
Happiness is a stock VW