Never had an issue with quill stick-out and rigidity on the Acra LCM, exception is when I am spinning large face mills or very heavy cuts. I do all my drilling first, jig up for multiple parts and then switch to a spiral tap and thread each hole in one shot. I use the DRO to go to each hole. You can get a riser for the mill, number of people just get some rectangular steel, bolt it to the mill base and then mount leveling feet outboard. Issue with casting a base may be the loading under the feet mat be high, so may need a plate to distribute the load.