I don’t listen to too much of the more classic prog stuff, but here are some more modern ones that you might be into:

• Porcupine Tree (Gavin Harrison was the drummer in King Crimson)
• The Pineapple Thief (Another Gavin Harrison band)
• Haken (Recommend starting with The Mountain - my favourite)
• Leprous (Older stuff has more distorted/screamed vocals, newer stuff is a lot cleaner)
• Thank You Scientist

Four Tet’s unpronounceable side-project is great too. Search for: ⣎⡇ꉺლ༽இ•̛)ྀ◞ ༎ຶ ༽ৣৢ؞ৢ؞ؖ ꉺლ

This EP is a great place to start: ooo ̟̞̝̜̙̘̗̖҉̵̴̨̧̢̡̼̻̺̹̳̲̱̰̯̮̭̬̫̪̩̦̥̤̣̠҈͈͇͉͍͎͓͔͕͖͙͚͜͢͢͢͢͢͢͢͢͢͢͢͢͢͢ͅ oʅ͡͡͡͡͡͡͡͡͡͡͡( ؞ৢ؞ؙؖ⁽⁾˜ัิีึื์๎้็๋๊⦁0 ̟̞̝̜̙̘̗̖҉̵̴̨̧̢̡̼̻̺̹̳̲̱̰̯̮

It’s a bit more analogue than his normal stuff? But definitely hits the “intricately crafted” mark!