My advice was going off of over 15 years installing systems professionally and not a DIY website for homeowners.
What you propose will work but with added cost and work.
What is the added cost?
After reviewing the two basic suggestions, I really see only three primary differences:
1. MPRotators vs. "TRUE" Rotators (and the requried GPM difference)
2. Addition of one extra head in the center of the lawn.
IMHO, the KEY difference to picking one over the other is the difference in GPM requirements. IMHO, it would be foolish for a DIY to attempt to build their 1st system designed to require 92% of the maximum flow they could produce from a bucket test. There's just hardly any room for error... and if there is indeed error, the result will be rotors that can't throw enough water far enough with no possible solution.
But using MPRotators requires only about 50% of the maximum flow from the bucket test. That leaves plenty of extra to work with when things are not quite right. After all, not only .. and the MPRotators can also throw 25 to 30 feet.
OK, hold the phone!!!
I do see the one thing that wil seriously add to the lastest plan for MPRotators layout... Pipes and trenches. Obviously adding a head in the center of the yard requires at least an extra trench from the edge to the center. But the other thing is to place the corner heads on one circuit and the center heads on another requires potentially twice as much pipe. Not including the pipe to get to the yard, one plan requires about 160' of pipe, while the other requires about 290' of pipe.
So before you decide how to setup your circuits Andrew, pull out a piece of paper and map how you plan to lay the pipe.