Excellent. I'll have a go at that.
Updated with the new working state and hidden status bar:
If anyone is interested, here is the code for my WAF:
automaton.zip
To be fair, it is a dead-simple time-delayed forwarder that just loads a web page (the same I'd load on a phone or computer). What I really wanted was the purest canvas to draw on. All the heavy lifting for the home control is handled by
http://route.io. I'm happy to explain further if anyone is interested.
Thanks for all the advice!