Standard Steel Beams

[wim (Wim Dekeyser)]

If you have that script you might want to post it and perhaps someone can check it for RH5 / 6.
Other than that, search for e.g. structural steel on www.food4rhino.com.

Here are a few that might be worth looking into:

Karamba

RhinoBIM

BullAnt

Rhino Beam Tools