Zen Cart Customisation

Hello, I'm looking for someone experienced in Zen Cart customisation. I have a Zen Cart based site hosted & nearly ready to launch, but require the following work carried out before the site can go live: 1. The site will be stocked from xml feeds supplied from a wholesaler. The feeds will contain all the data pertaining to the stock & these feeds will need to be fully integrated into the site. A percentage discount will have to be applied to all products sitewide. 2. The product catagories on the front page must be displayed as images in a grid format (I can provide examples if necessary). Notes: I am experienced in HTML/CSS/SEO & have a good grasp of PHP/MySql, but feel that this project would greatly benefit from an experienced Zen Cart Developer. Please do not apply if you have no experience of working with Zen Cart. Additionally, I have already received two commercial quotes for this work of £700 & £450 which were higher than my budget allowed for. There will be ongoing Zen cart work avaliable for the right developer, should you need any further information before placing a bid, please get in touch & I'll do my best to provide detailed answers to any questions quickly.