Thanks for looking, I was beginning to think I was posting solo in this thread
Most of my frame is 80x40 with some 40x40 for trimming the table edges. Going to 120x40 would be overkill for this size project as far as I can see unless you have a cheap supply to use up.
If you would care to share your sketches i would be keen to see another perspective on the build; I am working through various ideas for the Z-axis right now.
Some of my latest ideas below.