I wouldn't do 1/4" 6061 in that application without a steel skin on the lower portion in which case you'd be better off with 3/16" and skin the lower with 1/8". It would be really nice if we could find some 1/8" AR400 or equivalent for this stuff.davescustom is 3/16" IDK why i was thinkin 1/4".
that means 1/4" aluminum is just as good. if i knew a local place that bent it i'd try and have some blanks made. maybe i'll have to dig a little deeper.