The first photo below shows the post attached to the bottom inner frame assembly. The post are made from 2X4's that have had 1/4 inch planed from the broad side surface. Also the outer side of the post are trimmed down to 3/4" to match a 1X4. This is for attaching the side panels. They match the ones from the canopy which used 1X4 for the post since they do not bear the load of the tank full of water. The inner side of the post have been trimmed at an angle to allow a Sump to be inserted in ...