Basically I've constructed a raised shed foundation using piers concreted into the ground, however they are out of square by 2 inches in opposite corners, so the shape is a slight rhombus. See below circled in red, the same has happened in the opposite corner.
The parallel piece on top is square, so I could either continue building on top of this and leave the overhanging piece visible (how could I hide/cover it?) or potentially add sistered joints on the shorter joists to bring the structure square (best way to do this?).
Repositioning the piers at this point isn't really going to be possible.
Please suggest anything else I haven't considered.