WordPress document indexing integration with modified search & results

Overview I am currently developing a site for a client which requires an upload folder outside two wordpress installations to include document indexing. There are several open source solutions such as Lucene, Solr, Swish-E, Glimpse, FreeWAIS, Google and Yahoo search APIs. The two wordpress installations share one DB. Deliverables The client will be adding files via the media library. The media library and DB will need to be modified to include tags, category, author and event. The search would search WP DB and the Upload folder contents using a document indexing method. The results would be tabbed with the following: | All | Category | Tags | Author | Event | PDF | DOC | PPT | This is the style that I would like to follow [login to view URL] Core modifications have to be listed for future upgrades. Partial payment will be applied when you have a working system on your server. Final payment to be made upon working and tested version on our server. Testing will take 7-14 days. Fixes from testing should be included in cost. Please take your time to cost this job effectively. Please note once budget has been approved, there will be no added costs. Failure to meet timeframe will also result in deductions in final payment based on a per day basis. This job is ready for immediate start. Let me know your method, timeframe and cost