Here's a google doc
I made yesterday that converts real-life stats to ratings for a FBCB recruit. I'll continue tweaking this as time goes on and I get the time/hankering, but it's a good rough first go. Some of the ratings are randomly generated (like Stamina, Intelligence) but most are based on statistics/averages from the 2015-16 season.
This is probably most useful in a scenario where you want to import recruits into the game and don't feel like generating ratings or want the players to "seem" realistic.