So - does anyone know if the players' contract details are public information, and where one might find them?
If you were thinking of the bonuses specifically, the rules on what kind of "individually negotiated bonuses" the Club and the Player are allowed to negotiate on in the Standard Playing Contract are in the CBA Exhibit 5. (You can google "NHL CBA" and download the ~10MB PDF file). Exhibit 1 has the Standard Player Contract, there's actually very little that the Club and the Player really can negotiate about.
The teams, as a rule, in practice tweak only the total aggregate maximum sum for the ELC players. Some guys get the full £850k for Schedule A bonuses, some can get for example $500k, many get nothing. You can see these on CapFriendly.
But as the individual bonus categories and the performance you need to have to get a bonus go, it's a safe bet every one gets the maximum allowed bonus category bonus ($212.500) for the minimum allowed bonus performance (20G, 35 A, 60 P, 0.73 PpG...). The potential bonuses count against the Cap until impossible to achieve, so any creativity would only mean more hassle for the team. And obviously you don't want to piss off your young talent with extra hurdles en route to the money.