What did you do to stiffen the column? I've thought about converting mine, but it flexes and chatters so much, I didn't think it would be worth it.
For cutting aluminum the column is fine as long as you're careful with your feeds and speeds. As you can see in the second video my 4 flute cutter is only doing 1mm depth and 50% stepover at a very conservative feedrate. As soon as the feeds get too aggressive you can hear the chatter so I always start slow and gradually go faster. After a while you get an idea where the best numbers are so setup gets easier.
I actually used this as a vertical lathe to cut a bunch of pitbull front stand pins and it worked brilliantly. I had ceramic lathe tooling and once I found the right speeds I cut each one with no chatter at all. It was one of the few jobs I actually made money on.
tadaaaa:

(The Estop)..