Hi Guys. Yes, I had considered your idea, Rtwpsom2, and I do have one of those nick-nack shelves I picked up at the local craft store that I stained and finished that is 46 inches long ands almost 7 inches wide that would be an ideal place to put the completed gun. And to top it all off, this shelf is in my back bedroom, so it's out of the wife's way, as I am in total charge of cleaning this room, since it has those 'models' in it. Ha, ha! This is probably where it will go, one of these days.
And your idea too, 26WC666, has a good deal of merit as well. A tunnel mouth at the end of the setting would be the perfect touch for the Leopold gun in it's Italian enviornment. Like you, I don't think I've ever seen a photo of this gun's setting during the Anzio campaign, yet. But I would have to guess that if you could find some photo of any type of R.R. tunnel entrance in Italy during this particular time period, it would serve as a basis for making one for your own. I would have to guess it would probably be made out of stone, or maybe concrete, or wooden beams (which I kind of doubt), but who can tell.
In the model R.R. items, there are companies who make these structures for tunnel openings and this should give you some idea of how to make one yourself for this scale.
I also asked the guy who ownes the local hobby shop about track for this 1/35 scale model and he said that "G" scale R.R. track is probably what a person needs. Now I was also informed that they do not sell just the rails by themselves, so a person has to buy the compete unit, rails and ties both. But it's a relatively simple matter to remove the rails from their plastic molded ties and make some new ties out of wood. And the man said they do sell the seperate rail hold-down clamps and 'spikes' as well. So that's a help. It would be nice to happen across some R.R. modeler who has some extra "G" track and would like to get rid of it at about this time. But I don't have that kind of luck. Oh well! Such are the trials and tribulations of this hobby!!!
Good luck and take care, sgirty