I struggle with this as well. It is very difficult to get the heat into the thicker plate without melting the sh!t out of the sheet or warping it. With it being welded all the way around it probably doesn't really need to be welded from the back but it will be super-cooper strong this way! I usually weld things way more than they need to be too. I'm trying to get better about it but once I start running a bead it's hard to stop.
