Layout of 320amp meter base with 2 discos feeding house and connected garage panel approx.75' from MB location.here's my layout. 320 amp MB then 1-200amp disco on @ side of MB.1 feeds existing house panel & 1 feeds new garage panel. Good so far? Separate grnds. & neutrals in @ panel. I'm using 4/0 ser/alum(4 wire) from @ disco to feed @ 200 amp panel. Good so far? Question is, am I allowed to use the existing weep holes in the disconnects to enter or exit with my #6 and #4 bare copper or must I use a 1/2" knockout with a connector ? And anything else you might think of to add or correct ! Thank you