289803 Joomla Add On Module

I need to add following functionality to our existing joomla website. Normal shopping cart function PLUS - Quotation function ( select items but no price visible to buyer ). This is then sent as a "quoting shopping cart" to a definable email address with a unique ID. The ID is clicked on by a redmond sales person, finishes the quote and then can send the quote to the "prospect". The cart would store all these transactions. If the prospect contacts us/we sell the deal, then we use the "quote ID", convert it to a tax invoice and then transact via the payment gateway in the shopping cart - then send all details including the transaction amount reciept via email to the buyer. The finished tax invoice needs to be emailed to an email address and an attachment added that is exportable to MYOB - into the sales area and a card file for the buyer registered in MYOB. I also need an inventory facility added to the shopping cart, so that I can track stoc and add stock, and a purchase facility added so that I can order stock upon a sales closing, and stock is decremented..