Could I use a pre-built CMS or should I build one from the ground-up?

I am working on a project for a client that started out as a simple CMS with pages开发者_C百科, posts, and a directory. The client is constantly expanding the scope of this project with requirements for customization of just about everything. As a single developer, I am having trouble keeping up with the clients time-table. I have googled for software packages that might already exist that proved the features my client needs but I have not found anything. Does anyone know of any pre-built software that allows for the following customization or at least better words to describe this type of package?

Here are some examples of the customization that is requested:

• A page or directory listing needs to be formatted from an admin-defined template. Within this template there needs to be admin-defined sections that contain admin-defined data types. (This is so the look and feel of the site can be maintained while users can easily build content, add listings, and etc.)

• Advertising-tiles need to be able to be defined and populated globally and at page level.

• All user generated content, pages, posts, and directory listings need to be associated with user and have flexibility to show all other user generated content for inter-linking between same users content.

• Site would need billing/e-commerce system for premium listings, premium posts, advertising tiles, and etc.

• Approval system for all user added or edited content (pages, posts, directory listings, etc.)

(asp.net and mvc are definitely preferable)

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Site would need billing/e-commerce system

This is the number one reason you should not roll your own. Find an established CMS and take the time to learn to use it.

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My dear friend,
                       I've read your question & I may suggest that you should try some open-source CMS software with your own which can generate, display admin-generated templates & other stuffs.
                      You should use the

• Pre-bulit CMS software for keeping track of pages.
• Your own small customized cms for maintaining templates.
• osCommerce (open-source) for eCommerce support.

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I've not had a change to use it, and I'm not sure if it will provide for you all of your demands or not, but I've heard a lot of great things about the project. Have you tried the open source project Drupal?