I am building the Acro 510 and it seems my X axis is a little shorter than it is supposed to be. The crazy thing is the main vslot is 1000.. the same size as the front and rear brace. Buy when trying to square up the frame the front brace sticks out about 5mm past the Y frame. I will upload pictures in a few hours when I get back home. Am I crazy or did I square it up wrong?