I thought of mounting the magnetic door switch on the hinge side of the door frame and the magnet on an arm attached to the door. Can you make up some nifty mounting arm on a 3D? I’m forced to use aluminium extrusions bent into shape, and it doesn’t look very good. White would be a good colour.
Btw your gas alarm really saved my bacon. I was at a steakhouse on Friday night (spending a big piece of my salary) and I got an SMS on my phone about a gas alarm. I phoned my son and sent him to close the valve on the cylinder which I’d stupidly left open after I worked on the cooker. Seems like there’s a perished rubber somewhere. One spark and my neighbour would have had a large part of my Exclusive in his yard.