HO scale bay window caboose kit, less interior, trucks, wheels, coupler boxes, couplers, steps, handbrakes, end railings and other details. This is just the basic body, roof, ends and underframe. The other parts aren't practical to 3D print, so I recommend using Moloco draft gear, Athearn Genesis trucks, Moloco or Plano crossover platforms and steps and Moloco handbrake details along with wire and styrene shapes to complete the model.
I am not an expert on either the Chicago Northwestern or the Rock Island, so I can't claim these cabooses cover the fleet of either railroad completely. In my research I identified four Rock Island bay window caboose types and eleven Chicago Northwestern bay window caboose types. I have titled them CRIP A through CRIP D and CNW A through CNW I. The letter R after the CNW type denotes the caboose was rebuilt with plated over windows. At this time I don't have enough information on the windows of the CNW cabooses to draw them in the original form, so only the rebuilt types are available.
Following is a list of the names of each type of caboose and a description of that caboose type:
CNW 10524-10533 ex CGW 625-634
CNW 10323-10371 odd, 10350-10372 even, 10373-10397
CNW 10850-10874, 11303, 11309
CNW 10534-10538 ex CGW 635-639
CNW 11050-11074, 11075-11099,11304,11304
CNW 11100-11149, 11150-11199
CNW 11211-11229 (CRIP 17062-17068, 17070-17081)
11300, 11304, 11308 cushion underframe