Just been admiring your handiwork my friend. Very impressive, and I'm from an engineering background!
I doubt I will be taking on such a project, however, that's not to say I'm giving in. I'm thinking for where I intend to sit my machine, a timber frame may be an alternative option. I moved from engineering to shopfitting etc in my later years, and am thinking this may be a quicker route to establish the foundation for my router setup.
I fully understand the need for stability and precision in the final build, but I'm sorry, I have to factor in my impatience to get started !!
I think I may have to buy an imported model, that I then manufacture the support, stabilise and level, before "tyin' down the guy ropes folks" ha ha !