Last night I was researching transfer cabooses (again), and came across a diagram with some measurements! http://crcaboose.railfan.net/drawings/N-6Atr.gif
(The N6 and N9 were virtually identical, with some minor detail differences.)
The commercially available transfer cabeese are nice, but this exact type isn't available yet, to my knowledge.
I've always wanted to build one, so, off I went. Here's some pics from the build, which I hope to finish and paint next weekend.
The prototype cabooses were built from 40' boxcars, so I took the same route.
I started with a Atlas 40' boxcar chassis. Since I am using see through grating on the end platforms, I had to carve away non-structural material at the ends.
Next I built the frame using styrene strips. I also had to lengthen the chassis by an 1/8", so the strips in the middle are holding the two halves together.
Next I added the sides and ends of the cabin. I'm using masking tape on the windows to get the effect I'm after for the window frames. I'll remove the tape after painting.
Next I added the platform grating.
I forgot to take pictures for a bit after that, but I painted the inside black, glued in a sizable weight, cut a bit of roof from a Walthers 50' modern boxcar, added some ends to the roof, and added the steps and various detail bits. I also began the railings, which will have to wait for next weekend for completion. Z scale couplers will be glued directly to the underside of the grating to get the correct height, since I filed down where the trucks attach to the body for a lower ride.
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I might be building another one of these, so if anyone wants a more detailed build walkthrough with lots more pictures, diagrams, and parts lists, let me know.