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get some nice new leather Katzkin seat skins and get em custom stitched to your liking. That's what I did. Was under $600.00 including install, but then I removed the entire interior including the olds skins and disassembling the seats to save my lots of labor.
Of course I did get wheels first, before I moved up to leather interior, but since I show mine, I've got a lot of stuff done, but for starters, wheels would probably be the way to go first for you.