On The Fly Taxonomies or Custom Tables?

Hello,

I am building a website which requires an interesting structure. Please let me know if I should use on the fly taxonomies with custom tables or if I should use custom tables throughout.

This is the structure I am contemplating:

index
|---- Category X
|        |---- Add Case
|        |---- Paginate Category Cases
|                (Ordered by Rating)
|                      |---- Case XX
|                             |---- Read Case
|                             |---- Rate Case
|                             |---- Add to Case Details
|---- Category Y
|        |---- Add Case
|        |---- Paginate Category Cases
|                (Ordered by Rating)
|                      |---- Case YX
|                      |---- Read Case
|---- About            |---- Rate Case
|---- Member Functions |---- Add to Case Details

The structure is pretty much a one dimensional commenting structure, split into categories and cases.

I know I could build this using Taxonomies, but should I?

Thank you for all of your help!