Don:

No offence in the least...I'm only trying to keep you on track.

If you wish to "assume" 200Rc then be my guest, but I warn you...any theory you propose will be shredded to pieces. An error of 1.3 Rc equals 27 inches and if you believe Petrie erred by that amount then your theories are meaningless. If you believe the builders erred by 1.3Rc then you are dreaming.
Don't repeat what others in the past have done; it only strengthens the arguments from Egyptologists...that alternates entrap themselves into believing their findings to be true.
There is far to go and I repeat...time is on our side.

Now...
Petrie's measures are "gospel", if you wish to ignore them or use unconfirmed measures from other sources then so be it. If not then please use what I gave you...they are Petrie's and confirmed by others using the identical program that I use...AutoCAD 2000.
See [www.hallofmaat.com]
Relax Don...please.

Best.
Clive