Vintage kit: to restore or preserve as is ?

As example I'll use my Leak stereo 20.

I'm torn between doing a complete strip down, repaint, new caps and resistors and silkscreen graphics. Option 2 is just live with the blemished paintworks and do the minimum electrical work using NOS and salvaged components to keep it as original as possible.

Would a complete rebuild add to or detract from its value ? I dont plan of selling it but I want to preserver my investment.

regards