No we haven't engaged a building inspector.
My partner works in the building industry and so we didn't require one.
Our site start was first Wed in feb. this week we had our kitchen and bathroom cabinets installed and are being told by our supervisor on track for early July handover.
Not holding our breath that will happen.
Go in expecting it to run over and be pleasantly surprised if it doesn't rather then disheartened if your not in by Christmas.
It's not an impossible time frame but things go wrong during a build - trades are delayed, wet weather, things needing to be fixed.
Another option might be renting hotel by the month. Depending on how much your rent is it can work out pretty much on par. Remembering you won't have to worry about bills etc.