Have a look at the ten minute video at this should give you a good overview and also demonstrate quite clearly the importance of having the right tool for the job - how long would it take to do a simple beam to beam connection in Inventor (or AutoCAD) that was to a standard (including bolt lengths, notching/coping) etc.etc. Real world productivity for example: a 5 week project in Inventor woud be completed in 5 days or less using this Autocad based software so you should have no problem selling the benefits to your business (or yourself if you are freelancing). It will automatically produce detailed fabrication drawings for you in minutes (hundreds of them if your model is that big). I would suggest that if you need to do a significant amount of Steel detailing that you investigate a plug in to Autocad called Advance Steel - This is a specialist application for Steel fabrication and works to Steel standards throughout the world - It not cheap per se, but then it is not expensive either given the productivity it delivers. Inventor and other modellers are great for inititial concept design but as the saying goes the devil is in the detail! I would totally agree with with Bill Tillman's comment regarding using Inventor (or any other modeller for that matter) as the modelling overhead is massive in order to create even basic connections for examples, and nine times out of ten the generated drawing has insufficient detail for fabricators to work to so requires additional detail to be added.

Advance steel to inventor