I am building a tall set of loudspeakers (40 ") and was wondering a few things. What should I use on the bottom of the box to separate it from the floor, little rubber feet? and where to get such objects. Second, I would like a site address that shows how to make removable grille covers for the box, and lastly, how should I cover up screw holes, I set them in with a brad point bit on MDF and was wondering if any one has tried cutting plugs from MDF because the plugs from other woods dont match for my finish. Thanks, any feedback appreciated.