The stand looks awesome. Lots of strength there
Because of the way we build these 2x4 stands, I'd recommend you use some styro between the tank and stand. It will take up a lot, but not all, of the variances between the 2. Has saved many a people broken tanks
This stuff, or something similar. 1" is the norm and most use the pink stuff
It's also a temperature insulator for the tank, so it's nice to have