Great stuff Andy. A couple of years ago I made a spreadsheet very similar to what you just discussed. A few other web sites have done some work like this too, and they tried to quantify a player's career in a more modest way (like games started I think?)

Limiting our data to ALL PRO I think limits our analysis, but it is a consistent way of evaluating which round the best of the best usually get drafted in.

Keep up the great work!