I saw your post a couple days ago but haven't had a chance to get on here. What you are asking is tough for the construction industry. The data out there is very specific and very costly. I started looking 3 years ago and decided to just go out on my own and start building the database. Obviously there ...

There are so many factors to consider on this topic. I would do the excel manpower loaded in gantt format so it is easy to adjust. Yet, I would add an escalation column in case your trades feel something will be easier or more complex. It depends ** on what market, what testing is required, what specs ...