magento one page chekcout

Here is what I need: 1) On page checkout for magento store (layout will be provided) 2) implement google checkout (layout will be provided). Google checkout can be turned on or off. User has to add their google API as well in admin area. 3) Implement paypal (layout will be provided). Paypal can be turned on or off through admin area. User has to add their paypal API as well in admin area. 3) Buttons such as checkout will be changed to my custom buttons (will be provided). All images will have to be placed in one folder for anyone to change any image on the checkout. 4) Implement per domain protection, as this one page checkout will be used for resale. Using by Ioncube or other means necessary. Please specify how you can do this for me. 5) This custom app has to be tested if products are in shopping cart and when shopping cart is empty to make sure everything works. 6) Create easy install or provide zip file that user can upload. 7) Set up an easy editor under checkout button for us to insert any logo/text (layout will be provided) 8) One page checkout should be working with all versions of magento. 9) Set up website (layout will be provided) for user to purchase one page checkout product and ensure that after purchase, user can download this app and easily integrate into their site.