I agree the mold/form is time consuming but I'm looking into converting my plasma table into a wood router and having it shape some 3/4 sheet panels and stacking them into the form I want (cut/shape-stack-sand-seal) and making a heated vacuum-form table.
All I want is.....LOL a custom red ABS dash with the meter-gauge moved to the top of the steering column, relocate drink holders, change headlight switch to custom button, change MT/AT switch to custom button, and have a grid of accessory button locations and then have a huge glove box area.It would be nicer if the grid of buttons panel was removable to gain access to the fuses and relays, not sure if it could be done or should be done that way.
I doubt I could ever get the detail of the injection molded stock dash.