I have to say reading this post has made me want to tackle this project too. My Grindhouse source is only 25gb so hats off to you for having access to the ProRes file! I have Vegas Pro 16 as my NLE. I’ve got most of the laserdiscs for reference, and I’ll probably use the 1987 Japan Special Collection for the digital audio track to sync. If I remember right the print(s) have some audio issues.

I also have neat Video for noise reduction. Man does that make a difference. Pro 16 has a stabilize feature, so the scenes on the ship deck can be easily fixed.