It looks like all the possible topics of plug building have been covered in prior posts.
I think putting them into the proper sequential tutorial is key.
Part 1- could include through drilling; and blind holes for weight placement and through holes for hook placement, cutting slits for metal lips. Determining the proper size hooks and amount of weight for the plug. How each plug should lay at rest and under movement.
Part 2- could include what wood species is best for plugs, selection, sanding and sealing.
Part 3- could be selecting the right primer and paint (both with cans and airbrush), basic color schemes and design, color wheel, using netting to represent scales and a final selection of clearcoats. How to apply epoxy clearcoat.
Part 4- could include use of grommets, spacers, nose and tail loops in finishing off the plug.
That's all I got!