OSC One Page Checkout

Hi, We are currently looking to implement a one page checkout on multiple websites running oscommerce. The site is not currently live however we are looking to have this completed in a very quick turnaround. We require the checkout to work with both Gift Vouchers and also Coupons (CCGV), STS Template system, Points and Rewards module Payment methods that need to be accessable are: Paypal, Bank Deposit, EWay and standard payment modules. The current site has this addon installed (not currently working) [login to view URL] this module is acceptable but will need to be modified to work correctly. Please see current site at: [login to view URL] As we would like to install this on multiple installations we require full updates to the code to be provided along with full installation instructions. We look forward to hearing your thoughts and seeing examples of your work. Kind Regard, Emma