Best % type & Duration Type or mix for large construction projects? 

What works best while keeping it simple.  Using too many types means that you have to open up the type & multiple columns to understand the numbers and to explain to PM’s.  It can be too much for a simple construction project.  A main issue is reconciling with the Schedule of Values without creating too many activities.  (I think a matching code is best, too many items otherwise, & only have to get close with an adjusting item).  But also, for example.  Original Duration = 20, Remaining Dur = 10, Actual Duration = 90.  Does it seem like this item have 90% complete?  Yes, was originally suppose to be 20 days but that no longer applies once you are into it 90 days.  If we change the original duration to 100 then the original duration is no longer correct.  And adding the baseline original duration becomes info overload.  How would you handle the above and what is most commonly used to keep it simple (keeping resources out of it…)?  Do you use Fixed Duration & Units?  Do you both a Duration & Physical Duration type?  If using physical does it matter if there is a value in the Duration column? 

(At least with P3 people knew the calcs were consistant.)