Try this extremely difficult model and puzzle in one!
Scribe — Boxes and Booze
NKD Puzzle - Mechanical 3D Puzzle for Adults - Brain Teaser - Puzzle Box - Mecanigma - Medium Level - 541 Pieces : Toys & Games
NKD Puzzle - Wooden 3D Puzzle for Adults - Brain Teaser - Puzzle Box - Architecto - Difficult Level - 901 Pieces : Toys & Games
Architecto - Wooden DIY Puzzle Box Kit, Wooden Models & Kits
Wooden Puzzles - Puzzle Master Inc
Puzzle box Architecto in Kit (by NKD PUZZLE)
Architecto - Wooden DIY Puzzle Box Kit
All Products - Puzzle Master Inc
Architecto - Wooden DIY Puzzle Box Kit, Wooden Models & Kits
Treasure Box DIY Mechanical Puzzle – RunIt Decks