I do all of my subs with 8 guage and use a cheap single 4guage to 4 8guage distribution blocks in the box. I have studs on outside of box and 4 guage inside to the distribution block. cheap and easy to deal with. Just make sure to make them 18-24" long. Secure them up real good at the basket with zip ties and CA glue.
Do it and if you dont like it you can always take em off.