Update: While I would still love to get access to this series in true 1080p HD, I was able to upscale the entire series, and it looks phenomenal. I put a lot of care into every episode, using the 720p HD source when possible, and using the DVD source to obscure network logos.
There were several instances where I had to go frame-by-frame to correct little things, but I’m very pleased with the result. If I didn’t know it was upscaled, I’d honestly have no idea it wasn’t true 1080p.
If anyone would like access, PM me. I forgot how amazing this show really was until I just re-watched it. (I can’t believe it’s not available to stream anywhere.)