Modified an oil drip tray from O'Reilly's auto $12.01
Most of the sharp edges are folded over. The 1" lip provides a pretty good seal and gives it rigidity along the edge where it touches the lathe as there is no support under there. Fits like a glove. Took about 2 hours. It is a snug enough fit I'll try not screwing it down for now. If it vibrates it may get some screws.