@Maletrain , I would use the same principle as you mentioned. Boiler shell with add on pieces. Sand the boiler add the parts, bands could be grooves in the shell to fit thicker soft brass strips, rivets added with archer, etc. slip on can with smooth surfaces and glue in windows. etched walkways, stanchions, etc.
Maybe someday when I am retired. and not till I complete my PRR stuff (that I want).
Keep in mind that this price increase, if too drastic may force me to close Keystone Details altogether, if folks cant afford the little stuff I design. Speaker boxes, trucks, etc. Really worried how this will affect my shop.