Are there any construction clauses that need to be considered with developing a FFP service Base Ops contract that cover or incorporate DBA rates?
FAR 22.402(b), "Nonconstruction contracts involving some construction work," provides the answer. The contracting officer needs to review paras. (1) and (2) under that section to determine which situation applies to your Base Operations contract. If (1) applies, then Wage Rate Requirements (Construction) apply. If (2) applies, then the clause does not apply.
P.S. Please note that the term "Davis-Bacon Act "is no longer applicable.