I have some thoughts about the glass. If i make everything level, it should not be any need for a frame to mount the glass in? I have seen some of the bigger concrete tanks that uses av heavy frame in wood or steel, but i cant see the need for that in my tank.
Plan is to just mount it directly onto the concrete walls (well...of course after the fibreglass and expoy is applied.)
Playing around...while waiting for snow to melt so i can get some concrete to my build...