Event Espresso Wordpress plugin - customisation - jQuery

We're using the Event Espresso plugin ([login to view URL]) for a client. It's supposed to be used to sell tickets, but we're using it slightly differently to sell "exhibitor space" to companies for an upcoming expo (for the Gold Coast Marathon). The site is at [login to view URL] You can see the registration process that we already have set up (the rest of the Expo info will be elsewhere. I’m only responsible for the registration process). One of the extra plugins that Event Espresso has is a "seating chart", but this plugin is still in Alpha mode and it doesn't work incredibly well. However, we NEED this plugin, because when the exhibition space goes on sale, there is a mad rush from companies to buy certain spots. The Seating Chart plugin makes sure that people can only select "available" booths and locks out people from selecting the same booth - much as a normal ticketing system would. However, we need to modify the Seating Chart plugin to get it to do the things we want it to do. This will likely involve modifying other parts of the Event Espresso plugin as well. The GOOD part is that I'm happy for you to hack the plugin so that it just works. This isn't about being neat and tidy and making it all perfect. This website and this system will ONLY be used for this one event. So after that it doesn't matter. So feel free to "hard code" things to get them to work the way that we want. Here's a list of the things that we think we need to change: - Ability to select multiple booths (seats) via the popup. At the moment, when a user tries to select "seats", they can only select one, then they have to fill out the details and then go and select another seat. We want to modify it so that a user can select MULTIPLE "seats" (booths) at the same time. - Once booths are selected, require ONLY ONE set of registration details. At the moment (as you can see from the site), you have to enter certain details for each booth ("seat"). We only need to collect details once for each order. - Make the price changed based on the number of booths selected. The price decreases if a person selects multiple booths. At the moment, this option isn't possible with the seating chart plugin. - Add a button – CLICK HERE TO CHOOSE YOUR BOOTH. At the moment it's not clear where a user has to click to see the different booths and select them. I can give you access to my Event Espresso account so that you can view all of the documentation and support forums. I'm also hoping to get this project finished as quickly as possible. I would think that all of the above things should hopefully only take 1 or 2 days at the most. If you have excellent jQuery and Wordpress skills, this will be an easy project for you. Our budget is around $400 - $500.