This looks close to Wendler's recommended 5/3/1 for a Beginner (as on his blog Sep 07, 2011), except in Wendler's version says the following:
Each day perform ONE exercise from each category listed below. Perform 50-100 total reps (do whatever sets you want to perform - that doesn't matter) of each exercise. If you are too weak to get all the reps (chin-ups/pull-ups for example) then simply choose a SECOND movement to complete the total reps. This is incredibly simple to do.
The three categories to choose from are: push, pull and single leg/core...."
I am not sure if the assistance you have planned will fit that range of 50-100 reps per category. If so, it seems good to go. If not, you may want to adjust to that.
Many people find it useful to not plan the assistance in advance, but to instead decide during the workout. For instance, give yourself the flexibility to do tricep press downs if you are worn down, pushups if you are feeling good, and dips if you are feeling great. That is just something to consider.