Good, if wanting the 5 days thing.
Just suggest switching #4 day with #5 day. Have the quad day separating the back & triceps from the shoulders and traps days.
Gives extra rest because the back/triceps muscles are pretty much getting worked on the shoulder/traps days and vice versa. It's like working those groups two days in a row, which is not a great idea. Quads thrown in between the middle of those day gives better recovery time. Your choice, but forearm work after biceps.
Good Luck.