how??????????
Google is king
https://www.melevsreef.com/29g/sump/design.html
I am going to follow the instructions from this link and make my own. I even got some free pieces and glues from the whole seller to practice with and likely going to use thicker panels but now will consider the thinner ones based on shaun's pictures. Shaun could you post close ups of the case and tell me your opinion whether the thickness of your current case is sufficient? I was initially planning on 1/4" since it's such a large box