Hehe, once you get the fishies into the 10gal, you'll love it. I know how you feel though. Sometimes when I get a new tank, I get caught up in the stress of setting it up instead of looking forward to when it's filled.
Aah. I thought the lid didn't fit when the cutouts were already cut out. Yeah, I have my dad and his handy hacksaw do those for me. Last time I tried, I almost broke the saw.
EDIT: :( But Raz would happy that it can be used for another fishy who might have gone to a bad home if it wasn't for you. He would want you to use the tank and save another fish the same way you saved him.