Volume 7 of Professor Parabellum's Practical Scrap Metal Small Arms.
This volume provides plans and instructions on creating three different 100% DIY derringer designs. These designs are generally based around laminated (stacked and welded) steel plates.
"The following simple .22 rimfire designs utilize sheet metal plate for ease of construction without access to conventional machining equipment. Each model can be made in relatively short order and adapted to whichever materials or tools are at hand. In all instances pins or bolts can be used in place of welding or brazing. With care and attention a commercial standard of quality and functionality can be achieved."