My comment would be to think about how you are going to get around things when you have to do some cleaning. If your going to be placing any SPS, you don't want to make frags every time you clean the glass with an algae scraper. Leave more room than you think you will need between the glass and scape if you see SPS in your future. You may also want to see how water is flowing around what you have designed to try and ID any dead spots where detritus can collect before you commit to a final shape. Other than that, it looks good!