Does someone know the firm Steel&Graphics and their software ArTeN and TecnoMETAL for Autocad LT and Autocad FULL? I suggest you to take a look to those products, that work in full 3D, in Autocad LT too! You can download a Trial version of the programs directly on their website. Programs are full functionally for 30 days.
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The products of the line "Tecno" are specialized in Steel Structures, from the design process, to the verification, to the control of the CNC machines. The "ArTeN" Suites of program are about Architetture, topografy and relief. They realized a complet workstation for the activity of an Architect or a designer.
I've found this programs very great.
MF