I own a hardtop Space Shuttle and I'm a fan. It restores the game beautifully and plays way more consistent than what I had before. I disagree with Whysnow that nothing would place as nice as the original or that it is lots of work, but I do agree about being reluctant to permanently change a playfield.
Here are some shots of my SS: https://pinside.com/pinball/forum/topic/space-shuttle-crew-members-club-prepare-for-liftoff/page/34#post-4118933
For the amount of work that would need to go into your field to make it look new, I would rather go the hardtop route. That said, to me your playfield isn't that bad and you could just keep playing it and look for a more blown out field to do the hardtop on.