The subject should actually be the title of a book. Agamas can be called as grammer for temple building. For each type of temple, moorthy and sthalam (place) there are many things to be considered...the dimentions, the directions, the overall structure - all have been thought of and brought under specific guidelines. There were engineering as well as metaphysical reasons behind all this. I am still a novice in the subject - but I have read something about these things from learned scholars like Ganapathi Stapathi. It is very deep subject in itself. For example, the nataraja image we commonly see, is itself a subject of deep study and the dimentions, posture, expressions - all have very deep significance and meaning. The entire Nataraja image will come under a chakra of some kind and I have seen this picture.
Ofcourse, Raajarajeswaram (Big temple) has been haunted by some foolish rumours in the recent past - but this has nothing to do with the original grammer in which the temple was built.
Dr.Nagasamy's concerns are very serious - both from the Monument perspective and religious perspective.
Those who are interested, pl read "The Power in Temples" by one Sridharan or sridhar. This is not a book on "magical powers of temples" but a scientific approach to why certain things were built in certain way. It will be interesting to analyze some of the ancient Mayan structures and Egyptian structures in this light.
Remember - Raajarajeswaram has adopted a Pyramidal vimana structure! This is unlike all other early chola temples and is quite unique in nature... Have any of you read about the Power of pyramidal structures ??