Thanks for the demos, though I won't be able to try the latest ones for another day or two: I've taken my VGA circuit off the breadboard, in preparation for turning it into a mini-shield 
I've attached an image of my first design below.
After that my intention is to start on a library. I still don't know whether to have colour and 1-bit monochrome as two separate libraries or to just have one big library for everything.
