If anyone can help. We are in the process

If anyone can help. 

We are in the process of purchasing a 3 cone Trullo in Puglia, which needs extensive restoration. Total internal floor area is circa 60sqm. I have read alot about the process involves, re "geometra" and skilled builders. 

Could anyone from their experience in renovating a Trullo, has a rough idea of cost to renovate such a Trullo. It varies on the finishings, I understand, I am referring to the basics, renovating stone, walls, cones new elec and water system. Would appreciate any feedback, as this will determine, if I shuld for somethung different, or I m in the right direction