Lots of engineering models. Some spare parts for parts of assemblies. Not a lot of complete, flight-capable assemblies. I'm actually teaching a bunch of high

Lots of engineering models. Some spare parts for parts of assemblies. Not a lot of complete, flight-capable assemblies. I'm actually teaching a bunch of high school students to make a cubesat right now, and we are going through costing of: * Prototypes -> protoflight -> flight, no engineering model * "Flatsat" electronic engineering model, prototypes -> protoflight -> flight * Prototypes -> qualification article -> flight article, + "flatsat" * Prototypes -> qualification article -> flight article + ground engineering model There's a whole lot of derisk that happens as you go down that list, but the cost and labor increase (the latter is "free" for us but also limited) is substantial.