In my earlier days of play, I looked at doing the same…
Part of the issue you war going to run into is exactly what you stated in the first sentence. There are two skill levels, your personal skill, and your character skills. Both of these make and break any degree of comparison between ships… even comparisons within the same ship.
Sure, there are relative comparisons within hulls that can be made, particularly around the performance/isk ratios. But frankly, once you start comparing one hull to another that math gets rather crazy.
Think of ships more like tools for construction, something will always do X job better than something else. I can use pliers to remove nails… but there are better tools. EvE ships work the same, pick the right tool for the job you need it to do, inside that scope, you can do the comparisons you want… but that is still a large scope.
Also, anything beyond solo and small gang, those ship differences start to matter less and less. When you can have all your friends basically alpha something off the field… well… it no longer matters that ship X does 100 more dps and has 1000 more EHP than ship Y. They will both work in the setting you need them in, now it is just cost.