I am in need of some stiffening rib design advice. I am not sure if I am in any violation of asking design advice here vs SW advice but I am going to ask anyway. I am molding a hopefully flat cover to a battery case. It will be molded from PC/ABS (Cycoloy). Gated in the middle bottom surface of the part. the part is 10" long x 5.5" wide x .100 thk. I am concerned about the orientation of the ribs with regards to the part. I will be running the ribs parallel to the direction of flow (length wise on the underside of the cover). I will size them to be no more than .040 thk at the base of the rib with a .5 degree draft and no taller than 2 times the width of the adjoining wall ie .2" tall. The question I am asking is should I connect the ribs running lengthwise with some interconnecting cross ribs or diagnol ribs as well? I know it is easier to add ribs later if need be by machining additional pockets in the core, but what would be a good spacing length and width wise given the parts dimensions do you think? I am attaching some pdfs for reference.