Don:
Are you positive about your 29112" length...Petrie's angular measures produce as illustrate. Site layout has been confirmed by several others using ACAD.
Also note: All measures referenced to the south base of G1 as representing true alignment with east-west...the builders initial reference line.
There's a tremendous amount of math involved if calculated by hand, which Petrie had to perform using trig and log tables, but ACAD gives the answers instantly and without errors.
What an easy life we have today.
Best.
Clive