Seat box cracks

[graceysdad]

The botton folded edgeof my seat box in the Steak has plenty of cracks in it, so between this bottom edge and the steel mounts that poke up under the box that the alloy edge runs across they dont have some sort of stiffener there? seems a very weak design, any obvious fixes to cure it? was thinking about rivetting an alloy angle right across the bottom edge to try and support it, my job on Satdy is too yank the box out and see what scary surprises lurk under neath