I'm making little forays into a "zoning war" myself, Bill.
My technique now is, rather than an all out assault, is to whittle her down a little bit at a time.
They just don't understand that we model railroaders have this brain defect, so that the word "spare room" sounds like "train room" to us!
My oldest daughter moved out a couple of months ago, & I've had my eye on that new train...er...I mean spare room for a new layout.
When I initially broached the subject (the day my daughter was moving - bad timing on my part), I got the "don't even think about it" routine.
So I retreated back to my tiny N scale layout in the workshop, & have begun to regroup.
After volunteering my services to clean, paint, & buy some new furniture (ouch!) I'm beginning to see some light at the end of the tunnel!
So, after I've completed some really long "honey-do" lists, I'm confident that I can begin construction on my depression-era Appalachian short line in HO scale.
Well, better go...I gotta lot of work to do!