Looks nice for a diy. But I see a problem in the top. Did you radius the corners? And what size? On the corners of the tank and sump did you chamfer it?
In time the sharp corner of the cutout will crack, just like in sheetmetal you don't have sharp corners (cut outs) or it'll crack. The corners on the sump and DT are sharp and will cut, especially the top of the corners-
GL