IMHO Keep the original.
But, I have seen 2 approaches which enhance the value, or at least don't destroy the value. I have seen some masterful cabinetry using the original layout with beautiful woods and craftmanship. I have seen other 50s gutted and completely modernized with new lighting, floor layouts, mirror polished interiors etc. again the skill and craftsmanship is the key.
The bottom line though is this should be a labor of love. Whatever you do make sure you have fun. You probably won't get rich.
Sail on silver girl. Sail on by. Your time has come to shine.