Yes these are all methods to construct the Sri Yantra based on many accounts new and old-
and some perhaps are based on an analysis of old Sri Yantra on temple walls .
But my question about Sri Yantra construction has always been and may always remain unanswered.
Is this a true compass and ruler construction that will let us know the actual angle measures and edge propotions of
the triangles? Or is it more of a design without mathematicaly rigourous construction constraints?
I dont put it past the Vedics because they were very advanced geometers. The origins of trigonometry and algebra can be found in their ancient mathematics. But unless there is some document declared to be the oldest resource for the construction
of a Sri Yantra- I will remain a bit skeptic.

My investigation of geometric constructions (with compass and unmarked ruler alone)
lead me to the theory that certain things were impossible to construct with these techniques-
such as the construction of a regular 7 sided polygon.
This means that the angle 360/7 (deg.) is not constructable but can only be approximated.
Nor can regular polygons with 9, 11, 13, 14 sides (and there are infinately more) be constructed.
Angle trisection is another impossible construction.

So are all the angles in the Sri Yantra triangles constructable like a regular pentagon is?
I can define all the lengths and angles in a regular pentagon based on the radius of the initial circle
and using the Pythagorean Theorem (which Vedic geometers understood to some degree).

Anyone think about it to this level?

-Dan