SEO Glossary capabilities and flexibility

Hi,

I am working on a dictionary/glossary website (see attachment) and wondering whether I should have a solution developed from scratch or use your solution and customize it. Here are a few questions:
1. Flexibility to add as many fields for a given entry as necessary ;
2. Suitability for glossary with thousands of entries ;
3. Search engine autocomplete feature ;
4. Possibility to add tags to
5. Flexibility in display of entries ;
6. Flexibility in display of search results.

Finally, wondering whether you offer custom developments.

Thanks for the reply!

Phil