The Sri lankan had the technology or theory of Buildings or Constructions in the Vishvakramma or the Over-craftsmen of the Universe . the art perhaps the accumulated knowledge of ages.The Ideas, the beauty, rhythm, safety and proportions etc of any construction. This is mentioned in building the Mahatupa during King Dutugemunu[ 2 Cent BC].
We had the The Iron or Steel producing technology of the highest quality which we even exported, and was required for the tools and equipment to do the job, many of these tools were dug up during excavations, We had skilled craftsmen like stone masons , brickworkers etc who were clans of them that came over from India as mentioned in Mahawansa many times along with Queens that came for Vijaya and then with Sangamitta etc. This enriched these skilled trades that was already available here. Of course we had the required raw materials for this type of undertaking.
We also had the communication skills in the language or script and the Numerals for calculations, The formulas or the maths for calculation of most geometrical shapes and that had no approximate value for Phi as did the west, our formulas were more accurate.We had the Gold, Silver and Copper for money and the financial part or the finance or funding is very well explained by PARANAVITANE on Story of Sigiriya.This is also explained by Mahawansa authors on where and how these funding was obtained , not doing a Mahendran Scam, Actual figures of cost of labour and the budget is in Mahawansa to the nearest Million Silver Kahapanas.
With all these we needed only leaders with vision and marshaling of these resources and talents available in the Island with out out sourcing them to China, our Kings and Princes and Nobles[ Kat Usabs – Kastriya nobles who did not think work or labour as menial ] all had to undergo a specified education absorbing all these subjects, including law, this is laid down in Mahavansa more than once]. They had two Got-abayas earlier to this Gota.Recently I obtained a Garnet Seal designed to be hung around the neck with ancient script in mirror image Abayaha[ Of Abaya]. may have been used to seal and authorize building contracts and payment etc.
To satisfy the Yahapalanaya type of individuals who also existed and had to be satisfied in them days too , accounting and auditing procedures are laid down and can be read today on many inscriptions, some as early as King Mahasen who may have used it to audit the account while building the Jetawanarma , the biggest Brick building in the world, Looking at the coins finds it may be that of King Mahsen who issued the Lion and Dots Coins to pay his workers.
According to Paranavitane the first of a long series [of about over 30 types Kalanadas of Gold of various denominations, which I have examined] were regulated for the building of Sigiriya,
It is a pity we have not shared this knowledge with the world, so they think these feats out of this world or alien. Many of this is written down and I have enjoyed reading them and shared the salient points on my blog,