The angle is 1.5" by 1/8". The corner gussets are 1/8" plate and the four corner front/back angles are bent 1/8" plate as well (they are not symetical...one side is longer than the other and the tops and bottoms are different). Additionally there are two channel stiffeners on the top between the front and back angles.
If you want I can sketch up dimensions and construction details for you.
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