Thanks for your comments. I think the i-model export will be easier than our current method, will give it a try.
ProSteel -> ISM -> ABD for 2D review purpose is our second choise. Would be better to see it live, as a reference, at any time. ISM does not show the model in 100% detail as it´s not supporting bolts. But I will give ISM another chance at this.
I believe ABD do have a ProSteel object enabler built in, otherwise it would not be possible to see the full PS model as we do today, it´s just not working in callouts. I might be wrong here.
As for the ISM route, yes we are going there too but the other way around. We want to reuse steel structures built up in ABD to continue detailing in ProSteel and Tekla. We also need ISM to export IFC from ProSteel.