Well, Ed has come through with the instructions, but really, it's two sides, a front and a back, and a roof, plus a couple of add-on details.
I use more parts making a sandwich, and no instructions needed.
I have used the Kemtron cab, both the plastic and the brass versions, on several locomotives over the years, both for myself and for friends. If you want to add details to it, the plastic version is probably easier with which to work.
Here's the plastic one on a John English Pacific...(click on the photos for a larger view)
The tender, also plastic, was scratchbuilt.
Here's the brass version, built for a friend...
I soldered it together, first tinning all of the mating surfaces using a plumber's torch, then assembled it using soft iron wire to tightly hold all of the parts in alignment. It was then an easy task to heat the joints, in-turn, to create a solid assembly. I did, however, leave the roof removeable, modifying it slightly so that it snaps into place, but remains removeable.
Here's the locomotive as found (used), but not with it's original tender...
...and the re-worked version...
Wayne
Better than nothing.
kemtron by Edmund, on Flickr
Good Luck, Ed
Did someone reply to your question?
Regarding Kemtron Vestibule Cab (Brass) -Would any one have the instruction sheet laying about? I'd be happy with a scan emailed to me. Thanks.