Thanks for the interest in this project ......
As regards exhibition invites, I am well aware that this layout will be too expensive for some shows and I expect that I may have to subsidise the layout sometimes.
As regards setting up for operating, there is a church hall 80 yards from my back gate so I can hire that for testing purposes - maybe expensive but cheaper than spending £150,000 to upgrade to a bigger house!
As regards home operation, over the last 40 years I have built five exhibition layouts ( in five different gauges ) and never operated any of them at home - I've never seen the point of operating at home - only at exhibitions where you can put on a show for an audience.