What is true of any program is that the proof is in the results, I would agree with Angus that some of the accessory work seems a little random. But the structure that you have put forth is kind of similar to what I have done for the past year or so.
A good example of my training week:
Day 1: Squat (heavy or light alternate weeks) If heavy, work up to 3-5 sets of 1-4 reps. If light 2-4 sets of 8-12 reps and progress as fit
stiff leg DL: 2-4 sets of 3-6 reps
leg press, leg curl, leg extension, dimmel deadlifts all possible accessories I would use
Day 2: Bench (heavy/light weeks) if heavy same protocol as squat, if light 8-10 sets of 2 reps around 70-75% to work on comp form
lat pull downs, weighted dips, incline DB or BB
Day 3: Deadlift (heavy/ light weeks) If heavy, work up to 1-3 sets of 1-3 and it should be in the 85%+ range. Light weeks focus is on technique and using alternate stance
Low block pulls 2-3 sets of 3-5
Pause squat work up to one set of 3-5 should not be a grind (or front squat which ive been doing more recently)
Day 4: Strict OHP or seated OHP This I rarely go below three reps on, usually something like 1x10 1x8 2x5 and one rep out set
Barbell rows, incline DB, dips, raises, extra arm work
This has been my general guideline for the past year and took my deadlift from 655-700 from May to November of last year. Squat was increasing very well but had some hip injuries that sidelined me. Bench and OHP also seen alot of progress. If you are interested in 1x a week frequency maybe give this a thought, I would be happy to answer any questions you have in more detail.