The gallery seems to be down so I cant post a pic to help you out.

I wouldn't use a drill cause it can leave sharp edges or possibly crack the tub. I use one of the cheapy soldering irons from wal-mart and burn holes through. This leaves a nice rounded egde and makes less of a mess. Make sure its in a well ventilated area cause this makes a lot of smoke.

I'm not familiar with a tub using a lid since all of mine are in a rack, but I wouldn't add anymore holes to the lid and start on the sides of the tub. Maybe this will help trap the heat in.

Start with a few holes on each side, close the lid and let it sit overnight. Add holes as needed until you're at your target parameters. I wouldn't think a small tub like that would need a lot.