Pffff. Showoff.
No, seriously, those are really beautiful, I have seen them in other pics you posted, you did an amazing job. I agree, see what the cost would be to ship them and offer them locally or online, custom ordered, I think you have a great product! I would order some if the shipping is worth it!
Back to the original question,
I would stick to pre-made tops, they do have some with very flimsy screens and I hate them, I have cats and if they ever got on top of them they would go right through! I order the heavy duty screen tops, it is more of a grate and has tiny gaps in the corners for the thermometer cord to go through. They are cheap on Amazon, and have a variety of ways to open.
http://www.amazon.com/s/ref=nb_sb_s...aps,219&rh=n:2619533011,k:screen+top+aquarium
If you still want to make your own, make sure they are escape-proof and use a heavy duty screen that is solid, like the stuff screen security doors are made of, nothing that has any "give" when you press on it.