I think you're biting off too big a bite at this point.
This should be a bunch of smaller projects. Start with a
smaller book, like Monsters & Treasure, then move onto Greyhawk, Blackmoor, Eldritch Wizardry, Holmes Basic, Moldvay Basic, Cook Expert, Mentzer Basic, Mentzer Expert, and so on. Use the 3e stats since they're easier to put into GURPS terms (namely, monsters have attributes and their sizes are obvious), but go in terms of smaller blocks. For example, there are only about 30 monsters in Monsters & Treasure that are not already in DF or on your wiki, so getting a project going to get them translated is more likely to be successful.