I made good use of the repeating trick there: started with the ‘middle rivets’ and duplicated on the Y Axis by 3 interval and repeated that. Then added a cylinder, moved it enough to be in the middle and duplicated/repeated that.
Now, I COULD have just done that for vertical, then rotate it and repeat that, but then I’d get duplicate rivets. So, I just duplicated the ‘grid’ upward of rivets, duplicated the cylinders for the vertical bars and moved them into place like that, and repeated.
Then made that a whole item.