Custom Magento Checkout Development

I require a some Magento development for a custom checkout based on the attached specifications. The project will be managed by a professional project manager. Please let us know which project management approaches you are familiar with and which collaboration tools you have used in the past. Please answer the following questions; 1. Give one or more examples of a Magento extension that you have developed. 2. Supply five examples of what you consider an extremely good checkout. 3. Please list five critical features that make a good checkout. 4. Please list five common design flaws in a bad checkout. 5. What is your current availability and do you have ready access to a test environment? 6. Please also modify the sample plan in the enclosed document to reflect this project.