Shelfie- 18 feet long with soffit lighting
What made this a fun and challenging project was the size- 18ft long by 13.5 inches deep and 2 inches thick, placement (8 ft off the ground) and the need for it to be sufficiently strong to hold art books vinyl records through its length and house soffit lights. Also look presentable enough for DW. Bonus is that the rail works well as a pull-up bar.
The longer story- devil is in the detail is this blog link