I am considering vertical style as well, trying to get my head round it a bit ! I can certainly see its advantages with regards to space saving.
I also want a 4th axis and some way of clamping longer pieces to work on their ends (if that makes sense) but I guess this would work vertical or not.

I would like to see more pictures of the vertical style in action too. For workholding I was imagining using vacuum or making up a horizontal stop that could help position work reliably or something. I often do smaller stuff and not always flat sheets for which i now use the blue tape and super glue method.

Ollie