Knife & Gun Collection Management

I want a PHP/MYSQL driven website to catalog, organize, report and display knife and gun collections for multiple users. It should consist of a password protected administration area for each user and a gallery area for the general public to browse. Multiple configurable fields should be able to added, named and type casted from within the site. For instance, I may want to add a database field for the knives category called "date of sale." I should be able to click on a link to add a field, give it parameters for size, field type, etc and it will then appear on the data entry form for the knife category. I want to be able to upload multiple images for each item in the database, as well as select a single "index" photo to be shown in the gallery. The gallery should be configurable to display by maker, type, etc. I want a reporting feature for insurance purposes where I can do simple queries of the database and create a printable report showing the basic details in a list view, as well as total dollar values for any monetary fields in the report. The report should be configurable as well. I envision a form with simple check boxes for fields to include on the report. Total item count should be displayed both on reports and in the gallery. When in the gallery, if I click on an index image I should be taken to a detail page for that particular item. This page will show all the details stored in the database for that item, as well as all the photos. I'm sure there will be some details to iron out, but I'm easy to work with, and extremely easy to keep in contact with via e-mail. I'm at a computer all day at work and can answer questions. If you have ideas along the way for additional features, I'm very willing to listen and evaluate. User friendliness is a big must as many collectors have hundreds of items to enter. If you are a user of vBulletin or other forum packages, what I am looking for is similar in overall design.