Custom item page in Zen Cart

Hi coders. I need a page on my Zen Cart site that will allow customers the option to pay for items they've ordered over email. Typically - these are custom items which are not built on the online store. Basically - I want to be able to do the following: Customer emails in bespoke item. I return with quote. They go ahead with quote, go to my Zen Cart website, enter a fixed amount to pay into a text box, add to cart (with notes), checkout and pay. This way the order is logged and accounted for. Server OS: Linux 2.6.9-023stab048.6-smp Database: MySQL 5.1.32 Server Date: 08/05/2009 22:10:49 Database Date: 08/05/2009 22:10:49 Server Up Time: 22:10:49 up 11 days, 9:01, 0 users, load average: 0.00, 0.00, 0.00 HTTP Server: Apache/2.2.3 (CentOS) PHP Version: 5.2.9 (Zend: 2.2.0) PHP Memory Limit: 32M PHP Safe Mode: Off PHP File Uploads: On Max Size: 64M POST Max Size: 64M Database Data Size: 2,161 kB Database Index Size: 720 kB