Dwajasthambam in Siva temples

[avpgp]

I interested in knowing about dwajasthambam ( flagpost); my querries are1. where it should be erected? imean the distance each from sanctom sanctorium, Nandi bhagavan, Balipeedam;2. the total height of the post from ground level aswell as total from basement3. the desighn of the top portion4. what is the preferable metal to cover Brass or Copper5. any other details pertaining to Aagama vidhigal to be observed6. is there any special type of Stapathy required for this or normal man who construct Gopuram etc