Thanks for the much appreciated info to you and all the kind posters!
Welcome! I just recently set one of these up and have just finished the nitrogen cycle and waiting for some algae build up before adding some clean up crew.
I just took the tape measurer to mine and can confirm blaxsun's dimensions are not rough but precise. Though there is always margin for error in the manufacturing process, i believe you are set to create your outline for planning!
Hope you will make a build thread, look forward to seeing your progress along side mine. Hoping to start my thread by the end of September!