3.5 Version but I converted it to C&C myself. I have to confess that I'm not 100% certain that said conversion was correct but what the hey?
I believe that is one of the beauties of the C&C system. The base C&C rule set is so malleable that you can fold, spindle or mutilate it any which way and it still works pretty well. Likewise, you can add complexity back into it as your tastes dictate (skills, feats, PrCs) without causing lots of problems.
RE: Master Tome - I'm not sure that any of the groups I ran through the cript actually fought
the Master Tome. Several of the groups didn't get that far before having a TPK.
I think there was only one group out of the six that even opened the door to the library. As soon as the Master Tome started casting his first spell at them, the retreated back out of the library. Some doors are better left closed!!!
Just out of curiosity, do you think your C&C players would venture back
into the Iron Crypt, should the need arise?