As well as 7 years technical experience with .illustrator and Photoshop, I also have experience building 3d world environment.
For a previous client I created designs for vector wall art This was used as the foundations for the whole project.
I am NOT going to recommend that you use something similar. However, the project has given me an excellent understanding of the principals involved in building and managing an ORM and the technical advantages and disadvantages of choosing one. I believe I would be in a good position to analyse your requirements and advice on the best manner of proceeding.