Welcome to the Forum, John!
There are others here interested in astronomy and restoring motorcycles.
If you are familiar and happy with the Seig machine-tools I'd suggest as a start, looking at the larger machines in the same series. If nothing there to suit your needs, try Warco.
The dovetail column type machines, with either knee or a rise-and fall head, are preferable to the round-column mill/drills, because the rectangular column maintains the centering when changing the table or head height.