Positive Battery Cable

Prices are sky high and I'm interested in making my own. Only problem, though, I'm not an electrician and I am unfamiliar with load sizes and required gauges. Is there any room for improvement on gauge size versus the stock cable? Stock cable number is 2983649 according to the part manual. I couldn't find specs in either manual aside from length. Thanks in advance.
@crackedback makes some nice ones as well. [FOR SALE] - Custom Battery Cables