Ann,
On one level the two deliverables (repository and website) you identify in your vision document sound completely doable. But when I start digging into the specifics of the vision document, I get a little worried about the scope of your project.
The initial foci for your pilot are small finds (KORA) and faunal materials (Open Context). But you also mention documents, photographs and objects as well as oral interviews and field journals. These are vastly different types of materials — research data (field journals), museum collections (small finds) and structured data (faunal database).
If you intend to publish the faunal data via Open Context, I suggest you pick one of the three other types of resources for the pilot KORA repository — small finds or field research data (field journals, maps/elevations, etc.) or primary source materials (oral interviews and photographs). Focusing in on one of these subsets will allow you to fully develop appropriate metadata for those specific materials and become more comfortable implementing the metadata schema. From there you can perhaps research metadata standards that will be useful for the other types of materials — mindful of how the schemes overlap with metadata used for your pilot.
In short, I suggest you tightly focus your pilot. If one of your broader goals remains digital repatriation, consider which subset of materials you have described in your vision document will have the most significant impact.