Rocardoco - Thanks for that. It makes sense and I was considering a similar thing but making use of the T Slots for one axis and maybe bolt a piece of acrylic cut like a set square for the other.

Jay - Good point about the wear in a specific area, I had not considered that. Suspect it will be fine for now as it's for hobby use but as and when I have more time to spend on the machine I will take this into consideration.

James