A box works just fine. It also doesn't need to be made from metal. You can use any halfway solid material like cardboard or plastic just as well.
The only real rules are to leave at minimum a 1" space between the fan the heatercore fins (2" is better yet), close up any air leaks with whatever's available (tape, silicone, sealstring, whatever), and if you have two fans, put a divider between them so that each fan has it's own area of the heatercore to draw through.
I don't have a Gigabyte board, but my Abit shows the bios revision as the last two letters at the bottom of the screen when it boots (the screen that shows which processor is in there, first one).
You should be able to hit the pause/break button on your keyboard to halt on that screen long enough to read it all. Hitting enter afterwards resumes the boot once again.
Have fun, man!