It looks like what you are getting at is that the design is important. I don't think your original design is a bad starting point, much better than any designs I've come up with for my projects.
It'd be nice if you got into the details of integrating a themeforest theme with an existing code base. A reason I've avoided buying a theme, don't know what I'd do with it once I had it.
It'd be nice if you got into the details of integrating a themeforest theme with an existing code base.
Honestly, it's pretty simple: you have the HTML for each page that is demonstrated. Chop out the relevant bits for headers, footers, and then any tables etc. that you might need, copy across the various css, js and images directories and you're done! It really doesn't take long. Sometimes the themes come with PHP versions as well, but not always.
If you want to test yourself, why not try downloading an open source theme (e.g. http://www.oswd.org/) and take a look at what's in the HTML? I can't guarantee it'll be an identical process, but it should be fairly similar :)
It'd be nice if you got into the details of integrating a themeforest theme with an existing code base. A reason I've avoided buying a theme, don't know what I'd do with it once I had it.