Hello!
We are about to launch into building a Hub site for our large organization and we think the best way to start would be with an Open Data site similar to the one created by the US Forest Service - Geospatial Discovery Site. We have a requirement to deliver our published content to Data.doi.gov and consider the DCAT configuration tool that comes with the Open Data (template) a nice feature to assist us in meeting this requirement.
We want to start small with the Open Data site, but have considered the fact we might eventually need a Root site to link all the Sites and Pages into with future expansion. For now, we think the Enterprise Open Data site would allow public users access to search/discover our Agency offerings and allow for data downloads.
We want to plan ahead for future expansion, and we are an agency made up of a Nat'l Center, with an additional 11 State locations. As I mentioned we wanted to start small but plan for future expansion. We don't want to give all our State locations their own Hub site to be linked into the Root site in our initial deployment. Instead we want to set up our architecture in the best possible way to be able to expand to allowing state-center Hub sites in the future (linked in to the Root enterprise site).
Our requirements are that 1) we want to have one search box on our Open Data site that searches all the content provided by our Agency for public users to search/discover all our offerings because they might not know about out internal structure (Nat'l vs State locations). 2) Also it would be nice to allow users to be able to search each Nat'l or State location's content separately. My question to you is could this be accomplished by creating an Open Data Group for each Nat'l and State Center location's content? Or is it a better design to give each Nat'l and State Center location their own Hub/Content Library to be linked into the Root site for searching?
Remember we want to start small with an Enterprise Open Data site, and not allow all the locations to create additional Hub web pages in the beginning design. We also want to plan for future expansion.

Please advise. Welcome your thoughts!