Quoted from vid1900:I've been waiting for a warped bottom to come in so I could take some pics.
Rout off 2 of the bottom lips from the cab, then just stand on the bottom, so it drops out.
Use the old bottom for a template, and cut a new one from 1/4" Baltic Birch plywood (Menards).
Use 2 pieces of wood "Window Screen Molding" to replace the lost lips.
Probably a dumb question, so sorry in advance: but when replacing the “lost lips” with the window screen molding, do you simply use wood glue to hold everything together? Does the 1/4” ply need to be attached in any other way to the cabinet?