Finally got the last feature working (the lookup field type in custom fields). Once I had that showing up appropriately in the Search form, I realized that it would be better to have regular lookup fields show up as lookups rather than selects, on the basis that this allows for easier searching with LIKE and percents. Also tweaked a lot of the CSS settings, then migrated the changes over to the main site. Then I migrated the main site data back into my development copy of the db, so they're both in sync.