With regards to the build requests received thus far, the solar panel racks are approximately 20% complete. Most of the required parts have been acquired already, with a section of angle stock being the last section necessary acquisition.
The bogie backstop for the 1/2 scale track will be tested later today in the shop, the results from which will determine the trajectory needed to complete the build.
Go to Kevin's blog post this week for more specific updates on the builds.
Solar panel rack end sections.
Half scale bogie backstop.