I just went through the same thing. In the end, I built a stand with no chip pan at all. I built it out of 1/4 plate so it was plenty heavy. From my experience, if you are not going to use flood coolant, a chip pan just is a place for clutter to collect. I just let all the chips fall on the floor and sweep up instead of collecting in the chip pan. Rather than cleaning out the pan onto the floor and then sweeping it up. Just forget the pan and make cleanup a one step process.
I can always weld on a chip tray latter if I want, but see no need now that I have it this was.
Dennis