Just reading this post makes me appreciate my husband all the more. That is not meant to sound sarcastic in any way. It is meant to : "I hear you Sister, and I've walked in your shoes." My husband can be terribly difficult when it comes to doing things. Everything has to be done his way, or no way. And finally he backs me into a corner enough that I really have to assert myself --- this is when all attempts at diplomacy have failed, of course. And I just say: "Listen, this is the way it's going to be done, period, full stop, because I want it that way, and let's hear your first objection as to why it can't be done that way. Mind you, I said why it can't, be done that way, and not why you don't want it done that way. There is a big difference. So let's here the first objective reason about why it would be absolutely impossible, under any circumstances, to do it my way." That usually leads to sputtering, a day or two of silence, and I get things done my way, because he can't come up with a reason as to why it's impossible to do it my way. I don't like doing this. I save it for when "all else fails". But it works for me.
Stick to your guns. You will be using that room, and will be unhappy in both the short and long term if it isn't the way you want and need it to be. In this way, you will "pay for it" a long, long time if you don't stick to your guns. So hang in there.
We're ALL supporting you!