Drum Sander Drill-press Attachment

I've been thinking about this for a while.  I think that oscillating drum sanders cost more than I'm willing to pay at the moment.  I thought I would try to make an attachment that I could put on to my drill-press and do something similar.  Here's what I came up with.

It has two different size holes to accommodate two different sanding drums.  Just flip it over.  There's a port hole for the shop vac to keep things clean.  I added a door in the back to clean out anything that may get stuck inside the box.  As cheesy as it sounds, I was thinking of rigging up a foot pedal to work the press up and down so that both hands are free to hold the work piece.