i know you dont want to hear it but i gotta say it,and it is a public forum.lol
those stands are scary.
are you using styro under the tank?
i have one that is built just like those but only a 90g and it scares me.
it is my weakest stand,i did not build it,bought the tank and stand.
i plan to make a new one.
built this way,theres no cross bracing and the plywood in between the 2x4s on mine are bowed down from no bracing.
i know your not going to change these stands,good luck hope they last forever,but please tell me you plan to use way more wood and bracing on the 240g stand.lol