Looks good to me...
By a few weeks in you'll have bent a shepards hook and lost/left behind a nail so it will be bout right.
I like V stakes and Sheppard hooks as my tent use is mainly around home in the midwest.
Guessing you already know the trick as far as spinning the sheppard hook and burying the hook tip so it don't spin on you...
But the groundhogs do have an advantage in the rockier Appalachians over the V stakes... so having the two bomber stakes like that for a stake dependent shelter like your Duplex is a solid bit of thinking. Backed up by the pair of V stakes in a pinch. You get those two stakes right and the rest are replaceable.
You may find the groundhog and nail combo best but I'm not intimately familiar with that shelter so don't know if you have any critical stakes beyond the two main RL/pole stakes. I've heard many others in rocky soils and AT style terrain chime in along those lines. Even the TI V stakes with the punchouts can bend if you hit a tough rock, the nails and groundhogs tolerate that better. I don't think the Y truly offers any better holding power than the V... but it is more durable when you whack a rock or root when driving them in.
The nails vs the Sheppard is the same reasoning.
Specially if'n yer one to grab a handy rock or stick to hammer them home. But a hook can bend under the ol foot press even if you don't hit something. With a nail you'll probably put it through your foot before you bend the stake if you hit a subterranean obstruction.
Being an engineer you are probably versed enough in proper pitch angles and location of stakes relative to direction of load... that's probably the bigger real life issue with holding power.
Quite true that the capacity of sheppard hooks rip out on a main guyline but a V will hold fine in decent soil when put in properly... User error tends to skew opinion of UL stakes.