That structure is sensible, though I would not make every delay a breach of the timetable. Define one deadline for acknowledging a question and another for providing a substantive answer, with an escalation contact if either is missed.
Given the unknown renovation extent, a staged commission...
I would insist on a property-specific work plan, priorities, preliminary cost ranges, dependencies, a list of documents reviewed, clear exclusions and a named contact. Response times should be written as actual commitments, not “as soon as possible.” Fees also need separating into fixed work...