I started with;
GP Height = 147
GP Side = 231
GP Cubit = 0.525
Who is your mentor Monty?
I have looked at your numbers and they align with the model i have designed to link solar days at Stonehenge into the design of the GP and different projections of the GP height using different bases.
I have put the GP side 231 into the model and this is what comes out of it.
231 A Input solar days
7 B divide by 7
33.000000 C to give weeks as 10.5 22/7 Pi units
1848 D multiply by 56 to give 8 weeks in days 56 Postholes
The Megalithic Yard and Saxon Yard
3927 F-D 1443.75 In Thom's megalithic yards
3927 F-D 1190 in Saxon Yards
3.125 GP to Stonehege Ratio (Fixed)
231 E Input solar days
5775 F multiply by 25 so all 4 sides equate to 100
13.125 G Divide by 440 to give the variable cubit 0.525
Projected Height of the GP
3675 using the Sekhed 147
3676.526306 Using a Pi pyramid design
3676.964384 Using the modern metre
3677.43136 Using the ancient metre
All your numbers appear and are distorted by the fact that I multiply the side of the GP by 25 to give 100 (A Sacred number according to Thom) in the pyramid perimeter
So using the sekhed gives 3675 / 25 = 147 for the height
The variable cubit is 13.125 / 25 = 0.525
The megalithic yard and saxon yard section are divided into the GP perimeter minus the SH perimeter and if Megalithic rods are used 1443.75 becomes 577.5
Also your unit 231 is 33 weeks at SH and this is the unit used to trnslate the imperial into Thom's system which is the imperial /33 x 34 as 2640 x 34/33 = 2720.
The side of the GP is 5775 in this model as 231 x 25, or 440 variable cubits.
So we are using numbers that work in both systems.