I'm very impressed so far. I do have a few questions.
What does the 3.3-5.0 power switch actually enable? The sales page has a bullet point of:
" 5. 3.3V selectable for Port F and Port K" but port F and K are the analog input ports, no?
Could you better explain the power switch and what ports or pins it controls, how I would use 3.3 volt operation, etc.
I see you have posted a schematic drawing for this board, however it's for some CAD package I suspect. Could this also be posted also in a more common grapic format like jpg or pdf.
That's all for now, and thanks for the nice job designing and building your new Mega!