I’m aware of Adywan’s ESB reconstruction, and it’s very good - are there any for ANH and RoTJ available?
Yes. It is probably worth checking the 1997 Special Edition OT Preservation Projects category of the An Index Of Projects & Help Thread for Star Wars Preservations thread for all the 1997SE projects, but:
Harmy has a STAR WARS ReSpecialized Edition '97R (Released) - HD Reconstruction
and
ImBateman’s Empire Strikes Back 1997 Special Edition HD (a more accurate) Reconstruction (Released) - HD Reconstruction
ImBateman’s Return of the Jedi 1997 Special Edition HD Reconstruction (Released) - HD Reconstruction
may be what you’re looking for?