My favorite caboose, on my layout, was made, many years ago from two "bobber" bodies from AHM sometime in the 1970's. I hacked the bodies apart, left the cupola off towards one end, used three windows (of the four that were on both bobbers) spliced the two car body parts together, made a floor for it and installed a pair of three rail trucks. That caboose is not under glass but, rather, on the layout where it sees service whenever I run C&NW trains.
One other really favorite (actually two) are the two brass Milwaukee Road rib-side, bay window cabooses that I got from Weaver a few years ago. Did a bit of extra detailing, particularly on the interior, and they, also, are generally found bringing up the rear of my freight trains. Since everything on my layout represents 1950, no freight train can leave the yard without a proper caboose for the five man crew to inhabit. Weaver only offered two road numbers for those cabooses, otherwise I would have purchased more.
I also have a Mullet River, Milwaukee Road woodside caboose kit, but I hate to say it, that one is still in kit form. Partially assembled but still in the box, after several years of procrastination. That is certainly the most complex kit that I have ever tried to put together. BUT, someday i'm gonna get "a round tuit"and get it finished.
Paul Fischer