It is just a small I beam on 50x50x5mm box steel posts. We are going to run a trolley in the beam. The construction should be able to carry 1000 kg but we won't exeed 250kg. Most of the loads are less than 100 kg. I was surprised how torsion sensitive the I beam was, during construction of the frame I had to turn it over. So we braced the construction on the top to the roof of the building to prevent any movement under load, it is very solid now.Dude, nice work!!! Love the overhead crane setup.
I've never seen metal joists like that. Care to share details on them?