According to your calculation, I also came to approximately the material price. Then only the wooden decking, structural engineering, assembly, delivery, corrosion protection, railing, and the contractor’s imaginative surcharge are missing. That means we could calculate under 20k€ without the carport? Although "calculate" is an understatement since the loan is already fixed.For a steel construction made of galvanized HEA, I would estimate about 7,500 euros. I assumed 45 meters of HEA100 beams for this. Pure material costs about 2,500 euros, the rest goes for structural engineering, assembly, delivery, corrosion protection. Then there are the shed or carport and the foundation work to add.
I wouldn't build something like that out of wood; the maintenance effort would be too high for me.
I will outline how I envision the supports and spans:In my opinion, this construction is the most economical
I will outline how I imagine the supports and spans:
Are the blue blocks supposed to be the steel supports?
then the L-bricks at the carport could be "misused" as supports/beams, right?
Why? At least you could save the 2 supports on the carport. Nothing more and nothing less. You would still need the crossbeams.Building on two different techniques is flawed.