Your terms seem muddled.
Heat treated timber, what is that?
Drawn in we're we will put masonry columns filled with concrete to be the support for the roof. We will put a concrete beam across the beams.
Do you mean [ we will put masonry columns filled with concrete to be the support for the roof. We will put a concrete beam across the xxxxbeamsxxxx. COLUMNS ]
How far apart are the rock walls, you have changed the unit of measure, on the drawing so often much its unreadable!
What is this steel to be used for? "We were going cold form steel or LSF but price is beyond our budget."
What will be the infill between the masonary columns?