Hi Ross77
Right here I am again with the Mk10 drawing of the Z axis, I may see one or two other ways of doing this but I thought I would let you see where I am at this point.
I have about roughly 120mm of travel in the Z axis.
Now about the height from the bottom of the router mounting to the table top. Do you mean that would be 125mm?

Click image for larger version.  Name: Aluminium Built Frame Z Axis Mark 10.jpg  Views: 2004  Size: 85.7 KB  ID: 8755