Reddit mentions of Shotgun News Gunsmithing Projects Book

I'm a fan of this one, lots of specific build info and techniques: Shotgun News Gunsmithing Projects Book https://www.amazon.com/dp/1934622540/ref=cm_sw_r_cp_api_OaHgzb5SPDV83

Black powder kits are fun and easy, but i think you would be bored with one. It sounds like you have some basic skills and knowledge already, and most blackpowder kits are designed for people with little to no experience. Projects I give our shop apprentice: Stock refinishing (easy to do, hard to do well. big money maker), polishing with draw files, sandpaper, and polishing wheels (another huge money maker. takes lots and lots of practice, but little skills more than patience), AR15 builds (not incredibly cheap, but damn near impossible to fuck up if you take your time and do your research) Sight installation (providing you have access to a mill or drill press, drilling & tapping holes in a straight line is a big deal in Gunsmithing. Shot out barrels, or even pieces of cold rolled 1018 steel are good scraps to practice).

This is also a great book. it has some advanced stuff in it, but lots of beginner wood & steel projects, as well as practice exercises for machining and using hand tools. http://www.amazon.com/Gunsmithing-Projects-Shotgun-News-Staff/dp/1934622540

I would also recommend Shotgun News Gunsmithing Projects Book available on Amazon. If nothing else it's a very fun read. Here is the Amazon Link https://www.amazon.com/gp/product/1934622540/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1