The more detail the design, the easier it is for them to calculate a quote for you. I can take some photos next week for you as I'm out of town right now and won't be back until Monday. I'm not sure if those features will show up on a photo.
Since you're doing a 36"L tank, the rounded corners is same like TruVu. But if you want something different, you just need to request it. As for the top edge, I believe that most tank fabricators will flame polish after they cut. Krittertanks sands down the edge first, then they flame polish, so a much nicer finish. The do this on all their tanks.