Pingu,
As my travels out of my bubble have never taken me north of Santo Domingo it will require the response of other board members to answer the question you post.
As to your 2nd floor. If you, with a skill saw and carbon blade, cut a notch into those required block on the final course of the first floor and insert 2 x 10 beams and with the center wall of the house made of block you will have all the support you need. Built in this fashion you could even have wooden walls built in the interior of the 2nd floor to allow the building of closets and such.
I have no idea what the price of sheetrock is or where you can buy it. What most Dominicans use in its place is 4 x 8 sheets of particle board (yuck).
Rick
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