Like someone said you might want to make some detachable sides and possibly a partial front side or eventually you will have a milling job that you would rather take the mill outside to do since the crazy things can toss the cuttings up to 10 feet a good machinist apron is a must at the very least
I like your tray and back splash looks to be made for real easy clean up I might have gone with m 20 or larger for the feet adjusters but that is just me its not about the load strength but more about rigidity