Feedback I'm seeking on this: first, I'm wondering if these seem reasonable so far, or if there are some which should be higher or lower.
If NFL realism is the objective, I'd suggest a larger gap between QBs and HBs/WRs, the rationale being that elite QBs often flourish without an effective ground attack (Stafford in 2011, for example), and elite HBs typically can't elevate their teams (AP, MJD) without solid QB play.
The even run/pass philosophy complicates this, because very few teams reflect a 50/50 ratio. Given this, I'd also reduce the FB value, as many teams are phasing out the position entirely in favor of H-backs.
Second, need some input on what the other positions might look like in relation to this. O-line, D-line, LBs, DBs, etc.
If QB is the gold standard, LTs should probably be "close" (75-80%?) in value, while the rest of the line would be significantly lower.
D-linemen are tricky in that DEs are typically much more valuable than DTs, but NTs in a 3-4 are an exception to that.
LBs present a similar problem, with 3-4 rush OLBs being much more valuable than 4-3 OLBs. And MLBs seem to be declining in value across the board.
CBs should probably be valued similar to LTs and DEs, while Ss would be significantly lower.
Overall, I'd be much more confident commenting on position values once you've established rough numeric estimates, as you've done for the positions listed above.
And finally, I'll eventually want to figure how these values compare to values which might be assigned to draft choices. (If the #1 pick is valued at 500 points, does it make sense that the top QBs are 300 or so)
If the first overall pick is 500 points, in my view elite QBs should be valued at 600+, simply because I can't imagine Rodgers, Brees, Brady and a handful of other QBs being traded straight-up for that pick, not in a "realistic" situation.
As a Lions fan, I honestly believe Stafford would be unattainable at that price, even if the prospect in question is a "can't miss," in part because in the real NFL teams build their offenses around "franchise" QBs, which impacts their choices in the draft, free agency and trades. Once they're all in on a QB, it takes a haul to acquire him, given the resources devoted to his development.
Your project is really fascinating, and I hope something above is helpful.