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Looking awesome! I'm a huge fan of how you did/are doing the top. The extra 2x2"s were definitely a good call and I am glad that you decided to go with two braces instead of one.
As far as covers, have you considered glass?
When putting my top together on my last build, I kept coming across info leading me to believe that acrylic was inferior to glass when it came top using it as a cover. The biggest issue seemed that no matter the thickness, if the span was more than a few inches the acrylic would eventually start to bow. So that lead me to end up just calling a glass shop and ordering some 3/16" tempered glass (rounded edges of course) cut to fit my top; which surprisingly, was much less than I thought it would be. Pair that with some hinges and handles from Dr. F&S and you've got some quick, fairly cheap tops.
I can dig up the number to the glass shop I used as I'm sure it wouldn't be to far of a ride for you
If you decide to stay with the acrylic idea, then good luck to you and make sure to take plenty of pictures along the way!