FWIW I use padded (1/2" padding throughout) electric or electric bass guitar cases. Pockets in the neck, exterior pocket on the body. The e-bass one has so much room it carries my non-collasable 16"'build, Lucid reddot, Ace stock ... w/ a spare upper along side it. $20 shipped from eBay. Shoulder straps too! Zippers may not be YYK but have held up so far well.

Also have one sized to carry my 24" barreled precision model. A bonus ... the built-in velcro strapping to hold the neck, holds the barrel/forend in position.