The real problem, IMHO, is working out where to put the fan. The existing cooling holes around the handle would be the logical place - if it wasn't for the handle in the way.

I just hauled one out to have a look. It looks as though there is room to put a large, flat fan behind the handle recess, and mount it in a shroud to direct all the air out the holes. Being large you could probably undervolt it to run quiet.

Beware CRT yaddah yaddah