Website Gallery w/Descriptions and Control Panel

Basically I need a gallery (text and photos) installed on a website I'm working on that will allow the client to edit it easily. I can design the look of the control panel if needed to make it attractive. I need two quotes. The first quote will be based on how much it will cost to build this feature from scratch. The second quote needs to be based on modifiying an existing pre-made blog script. I already have purchased the script and got permission from the script provider to have it edited. I've used this script on several websites but I just need to know if it can be modified to be used as a gallery as well. The attached files should explain exactly as it needs to look and function. Please inbox me with any questions. I need a week turnaround once the project is awarded.