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Ok, it works I hope. Here is the only flyer I found, where you can see, how the hermle machines were build. On page5 there is a gantry construction and page 7 shows the normal construction. These machines run since 15Years or so, without problems. The spindle for the Y-Axe is hidden behind the spindlehead in the middle of the X-axe. I don't know exaktly, but I think in this case the have a stationary spindle and a driven nut. The only obvious disadvantage of these construction is, you need at least the complete Y-way free space behind the machine.

The flyer is free downloadable on the hermle homepage, so I think its ok, I post it here, without any copyright issues.