I always forget about Etsy for some reason. I like the look of the adjustable one better. I might give it a try. Also looking forward to what neonreef3d is going to come up with.An adjustable one. Seems 3d printed "stuff" is quite popular on Etsy.
https://www.etsy.com/listing/148101...PPgtXZ8E4EaAuxHEALw_wcB&variation0=3574472918
Also, just a suggestion since you're working on it @neonreef3d - A shade that creates a rectangular profile might be cool, extending the utility of the Kessil on rectangular tanks.