Converting a Real Estate Site

Other than messing around with drupal a little over the years..This is my first attempt to convert a live site to drupal.

I developed the current site GulfCoastCondoCenter.com over a year ago. My client has now realized the power of the Internet and wants more. I have been pushing them to move to the next level with blogging, rss, etc.. and they have finally agreed.

I've installed Drupal 4.7 and the following modules:

blog
comment
content
contact
flexinode
gmap
help
image gallery
img_assist
nodereference
number
page
story
taxonomy
text
tinymce
upload
views
views_ui

The new installation is located at www.gulfcoastcondocenter.com/drupal/

I have done alot of searching around for real estate modules and read some posts about talks of development happening. In this clients case I wrote a custom cms to administer the content on the old site. I would like to get in touch with anyone to assist in developing a real estate or listings module for Drupal.

I have read few ways to build flexinodes, taxanomies, etc .. but my client is not web savvy and the vocabulary is way over their heads. I need to provide them a simple interface to manage the listings so I'm not involved in day to day maintenance.

The DB: (there is more to it)

listings - (title, address, city, etc..)
types - (condo, townhome, land, etc..) - used to populate dropdowns
status - (just listed, new construction, etc) - used to populate dropdowns
photos - (listing_id, path) - image upload
features - (pool, hardwood, view, etc..) - Check boxes

Some questions for the drupalers ..

1. Is there a real estate listing module being developed?

2. If so, how do I get involved?

3. If not, is a listing module necessary or are the flexinode and view modules the way to go?

4. I modified the andreas06 theme. Do I need to document the modifications someplace?

5. Navigation
The tabbed navigation you see is generated from the primary links. I created the pages and copied the links in the menu module. I'm having issues with the sub-navigation links. I would like each section to have its own sub links be able to populate, but not really sure how to go about doing this.

I'm getting really stoked about drupal and looking forward to implementing the system in many, many sites!

Thanks in advance to any advice and comments on this!