I am working through a reader on Roman letters and came across a particularly difficult bit of wording (at least for me). It reads as thus: summa hominum est opinio tuos familiaris nobilis homines adversarios honori nostro fore. I took summa as agreeing with opinio and hominum as the plural genitive of them both. tuos familiaris nobilis homines came together as a chunk meaning Atticus' friends who came from senatorial families and adversarios as being what they WOULD be concerning Cicero's election.
The final product: It is the greatest opinion of men that your friends, the noble men of Rome [familiaris] will be adversaries to my election.
Is this a fair rendering? Help please?