Hello,
only minor things come to mind that might not fit.
- steel structure itself properly welded, weld spatter removed and galvanized
- bending-stiff frame corners in transverse direction, stiffened in longitudinal direction with a small bracing -> statically completely usual design
here it looks to me as if both round iron bars in the turnbuckle are touching? These could be 2-3 cm shorter
but I assume that this was tightened accordingly during alignment at the steel assembly and thus fits
- screws from purlins to rails could be 5 mm shorter -> makes a price difference in the per mille range
- attaching squared timber sideways to the purlin greatly facilitates the installation of the boards, as it prevents hundreds of holes having to be drilled by hand into the purlins
Only the end-side railing with 2 posts attached to the standing flat iron seems a bit too soft to me (picture 2).
But here too I assume it has been statically checked. Personally, with such railings, I always push the posts directly against one of the purlins.
However, this makes the posts asymmetrical...
On the 3rd frame, 2 bracing plates have been welded on too many. There could also be 4 bracing plates (2 pieces on the back side of the 2nd frame from the front), maybe another bracing was planned here (but not statically necessary!)?
Otherwise, I also see a hole in the lower flange of the first frame towards the second frame. Is this precautionary in case something should be hung up later?