So, running a game in the Tomb of Horrors for a group I know (Their DM is unable to DM them that day, so I volunteered.)

Because I've always wanted to see how it would play out, I've limited the class choices to the Generic Classes. I have however allowed most of everything else 3.5 on the table as long as they end up being ECL 10.

As per what their DM has told me, they really don't seem like the optimizing sort.

With those factors in mind, will I need to change any of the challenges to accommodate their options?