All,
At IRI, we had a full-scale practice field made from standard cuts of wood (2x4's, plywood, etc.). This design was made by Mark Koors, and is easy to assemble and disassemble. It goes together with no tools, once all of the component assemblies are fabricated. Also, all of the pieces for this field can be transported in a 16' trailer (maybe even a 12'... not sure).
To create the border for this field, it costs about $1,000 in lumber and fasteners. (overpass hardware and electronics not included)
Here is a link to a pdf, showing how to make this wooden field border.
For people who want to host a demo or off-season event, this may be a good alternative to the high price of shipping an actual FIRST field to their location. This thing does take a while to build, but it may be worth it.
Thanks to Mark Koors for creating this resource.
Sincerely,
Andy Baker