Hello Spirit, I am honored to be asked to do such. I think you would find some of the maps I have tacked would indeed have overlap, since I primarily am focusing on 1996 Quake levels.
While I haven't really dug into Quaddicted, due to primarily focusing on using the commercial shovelware, it is likely various levels are already being done.
- Armageddon 2 - Armageddon 2
- axeme7 - Eric Stevens\email@example.com - axeme7 - Eric Stevens\firstname.lastname@example.org
- Basic Castle - Basic Castle
- Bubbah's Lair - Bubbah's Lair
- Close Quarters - Close Quarters
- crosroad by g.ancheta - crosroad by g.ancheta
- Dave's Graves - Dave's Graves
- House of Desolution - House of Desolution
- The Crucible - The Crucible
- The Cult - The Cult
- Tower of Death - Tower of Death
- welcome to anoxia‘‘‘ - welcome to anoxia‘‘‘
So I think this is a case of me already tackling some of the Quaddicted database and I planned, as I moved along, to progress through the various levels. So while not having been directly, I was aware of the resource and was planning to include content as needed when I reached said point. I should also mention I noticed that while you had two Area 51s, neither is the AREA51 found here. I could also not find Entering Black Majik or Chaag.
I imagine links in the comments would make them more noticeable? While far from having a massive amount of content, we do have quite a number of levels here that are shovelware and thus likely included on Quaddicted, so it mostly is a matter of confirming they are the same and linking them up in some way.