Correct interpretation of static calculation for garage (reinforcement...)

Dear people,
on the advice of another member, I am posting my request here again in addition to the "Bauexperten-Forum."
We have an old house (1924 and an extension from 1994) and always not enough space (5-6 people...)!
Therefore, a second garage is to be built, which I want to build together with my neighbor (mason).
A static calculation is available, tomorrow I wanted to order the material and, unfortunately, the structural engineer is now on vacation.
Can you tell me from the photos how many mats I need for the ceiling and exactly where they should be placed? The mason and building materials dealer could not tell me with certainty...
Therefore, I hope you can help me.
Thank you very much!

He attached the installation plan after all: For the ceiling 3 mats Q335 on top and the same number on the bottom. Concrete cover should also be noted somewhere. Floor slab Q257 on top.

Thank you in advance. On page 3, it looks like he only wants a complete layer at the bottom of the ceiling and steel only on the outside in the upper area. On the bottom of page 3, the mats are also specified with a width of only 1.08m. Strange, everyone I ask says something different.

Yes, the reinforcement at the bottom center is statically required. For constructive reasons, 0.80 cm²/m were calculated at the top edges. For simplicity, he then arranged the Q335 continuously at the top and bottom. This also prevents shrinkage cracks on the upper side. For larger spans, this would also be adjusted accordingly in the choice of mats.

Thank you. Now I finally understand it :)