Be cautious. . 4 days in a row with 1 days worth of rest can be draining on the system.
Also, why on earth would you train back before leg day? If you weaken the back muscles how will perform at 100 percent of squats the next day?
day 1: Chest and Arms (triceps, biceps, and forearms)
day 2: Legs and abs (includes thighs, hams, calves)
day 3: OFF
day 4: Back and Delts
day 5: OFF
REPEAT
This will add an additional days worth of rest, plus seperate a number of bodyparts.
Here is something even better. . .
Also, the delts are receiving immense stress two days in a row.