Nice man, I was looking around trying to figure out how I was going to do my column, and what I saw that inspired me was part of someones gantry router, For your little sherline and that thing I would use 4" sq tube, thick as you can get, mill the bottom flat, then make a plate to go onto the bottom, weld it on, probably 1" thick, with your holes for mounting, before you do that, flycut the sides that need to be squair with the bottom(front and back) and weld another peice to the front and flycut that or cut dovetails or however you want to do it, I plan on using THK SR(I think thats the ones) linear slides for mine they can be aquired from ebay for pretty good prices, then if you want, you could fit your spindle to that.
For the Z axis, ballscrew isnt quite as important but get some decent leadscrew.
I know almost for sure that your steppers wont work on that thing, I picked up a nice bundle of motors(20+) 300oz/in, if you want a couple let me know Im selling them over at cnczone.
Jon
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