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Bridge building robots – Book 2/3 Coming soon!

Depending on how you look at it, my third children’s book on Bridge Building Robots will be out later this summer.
You can get the first two free ebooks at nieko-dot-com. (give some money to the animal rescue league as well)

Here is an image from the new book, I am going a little over the top on this one! (you should be able to see a bigger version by clicking on it?)

Bridge building robots boom

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Survey feet vs. International feet for 3D Bridge modeling

Some states use survey feet as their base units for developing bridge cadd plans. The difference between survey feet and international feet is very small and it is doubtful anyone will notice if the plans are presented as 2D drawings.

One international foot = 1.0000019685039 survey foot
One international foot = 0.3048 meters
One survey foot = 1200/3937 meters

But, there is always a but, what if the bridge design is given as a 3D model to contractors and fabricators for use as a measurement tool?

If the contractors and fabricators use the 3D model to determine lengths of girders and quantities, is there a problem if the models are in survey feet?

I would rather develop the model in the units that it will be constructed and this would allow the model to be exchanged between multiple software platforms without fear of a unit error showing up.

What units would you recommend for drawing a 3D bridge model?