I have owned my '97 Metro since new and have basically been concentrating on the exterior.
I dropped it 3 inches in the rear and 2 in the front, and put on some Motegi 16s with Sumitomo tires.
I had the quarter panels pulled out so there would be no rubbing. Have some low-mileage 13-inch Eagle wheels and Michelin tires for sale. Pictures of those should be posted in the upcoming weeks.
Hopefully, the car will have a bumpin' sound system by summer.