What is before me now is a laundry list of needs. I saw this coming and basically welcome it. The reason is, any big project requires numerous details. That is life. The best way to deal with the big project is to continually visualize the end result. However, here is what is probably not the entire list:

production model boxcar

switching steam locomotive (shifter, 0-6-0 wheel arrangement)

hopper car

test track (!)

car frame assembly jig (holder)

caboose

locate module drive train connectors

graphics

car assembly templates

track assembly tools and improved method

stirrup step assembly method

and other things...

that's all for now.