Work was my issue for not responding timely. I apologize. Running two businesses and having four kids is a bit time constraining LOL Also, my shoes were untied and the sun was in my eyes...
I have a few valid points for attempting to get you to change your mind on the lid. One is getting fish in and out. No matter what you're going to want as much space as possible. It's difficult attempting to catch fish from above... Second, getting decor in and out, again, the more room the better. I have a 9' piece of tree in my tank and let me tell you... it sucks monkey #@$%@ trying to get it in and out when necessary. Point is not to limit yourself.
If your plan is to have your filtration on top (which is wicked cool by the way) then why not make it a separate piece? Just use some 1x2 as cross bucks across the top that are removeable with stainless screws. All you really need is three, one in the middle and one in the middle between that one and the end. Then if you find that killer piece of drift wood or what have you then you lower the water level 50% and take off one of the cross bucks....
Is any of this making sense? LOL It's hard to convey things sometimes in electronic communication LOL
Thanks for the compliment on the tank
I like it too, I just wish someone would come over and rescue some of the 9 midas and 6 oscars in the tank LOL They're too big to ship...