Portfolio layout - best way to implement this scenario....

Hi,

I seem to have confused myself setting up some portfolio pages and need some help/advice how to go about implementing the correct way to build this.
I’ve attached an example layout image of how i would like it to work.

Basically I have 3 main options for the portfolio pages, each will generate a page to consist of a left menu (listing the individual projects) and to the right of this I have a large image with the project details.

So far I have created template for the portfolio page and a folder in the document tree called ‘Portfolio’ this will contain the projects and these are being generated with wayfnder (this works just fine).

So...I was thinking that I could create a chunk with the portfolio details and add a ditto call on the main portfolio folder page, but what do I add to the portfolio template for all this to display?

Am I doing this the right way around?
Maybe I will need 3 templates for each portfolio category (some of the info for the details will be slightly different for each portfolio option)?

Any help appreciated.

Thanks
J