I've just come across news of the Roman Fort Project, which has been awarded £50,000 from Barclays Take One Small Step competition to support new businesses.
The purpose of the project is to create a Roman fort using traditional techniques, as well as an education centre to be used by visitors and school parties. There are also plans for the construction of a civilian settlement next to the fort and agricultural land farmed using Roman methods. The project is currently looking for land in Cheshire or Flintshire on which to start the project.
This sounds like a fantastic project, which would have clear educational value. A number of sites (such as Wallsend and Arbeia) have reconstructed specific buildings from within a fort - but this is an excellent opportunity to create the whole complex.