Bentley View is available to anyone, free.
Your project team can view DWG and DGN drawings and models without file translation. It offers viewing, measuring, and printing tools, and even has MicroStation's design review features.
Are your consultants still stuck with AutoCAD R13 files?
Not a problem.
AutoCAD R11?
It will open that, too.
Try it - prove it to yourself that the full fidelity of your DWG file is maintained as you view, interrogate, and print design data. Have your consultants view the 2D construction or fabrication documents you e-mailed them.
Still not convinced? You will be when your clients use it to view 3D images, with image rotation, and intact material mapping on their own desktops.