There it is at last: the completed RFID doormat. Check it out:
Not a single screw was used. And it doesn’t look half bad I reckon.
However, there is a bit of a problem: the door opens whenever I step on the doormat, including crucially when I step outside. It’s not exactly useful to open the door when it’s already open each time I get out of the house. I need to train myself to step out with my left foot first - which is surprisingly unnatural since my door is left-hinged and opens outwards - otherwise I’m going to go through the lock’s batteries like no tomorrow.