3D Design Engine for website

I have a wordpress based website about conservatories. I would like 3d engine that allowed the customer to select a number of options and the engine would create an image of their conservatory. The first thing the customer would do is select their style. A list can be seen here ([login to view URL]). Images similar to this would be required for the customer to choose from. The second thing they would do is enter the dimensions of their conservatory. The third thing they would do is select the colour of (white, black, oak or mahogany). The last thing they would do is generate a 3d image of their conservatory. Finally, the system would then ask them if they would like to find out how much a conservatory like this would cost. The system would take their details (name, address, etc) and mail it to an e-mail with a copy of the conservatory they designed.