Hi Roger,
I'm roughly on the same part of the slope as you also
To get going I choose to put my lathe next to a wall. I made a substantial, albeit rough, A frame based stand with some 18mm MDF on top and mounted the lathe on that. (Mine is a very cheap & cheerful clone from far east intended as a beginners bench top model)
It could be moved in future if necessary, meanwhile the wall makes a good place for shadow board with tools and task lighting.
Am I correct in thinking you have one side almost all windows? I like the 'full height' idea, I couldn't do that in my barn, nor could I have windows anywhere except on one side.
FWIW I would go for the position by the window, don't build a brick stand, I found the A frame stand is OK for now (Yes, in a few years it may start to vibrate a bit, but you'll likely have another, better, location worked out by then
Edited for spelling errors