Manpower = Me
Cost restraints = if they had a budget they might had a consultant but I guess its what I can borrow on site.
Size = A large building. with a overhead crane and a Gard both. So I guess A lot of light fixtures and electrical outlet every 5m or so and a 3phase every 15m. and don´t forget ventilation/heating. Building 45X30X12m
Time = 5 weeks.
Its actually strange that you asked if anybody had done a similar project. I just remembered that I have done one. But not as in depth as yours.
It did maximum demand calcs for a building
very approximately 40 x 25 x 8. IIRC it was about 300A maximum demand. We had a main switchboard, and 3 large sub boards, and the Air conditioning had its own sub board too.
I didn't have to plot all the paths of the wiring but I had to check every subcircuit for correct cable sizing , breaker sizing and fault current breaker sizing.
Then made up a large spread sheet to calc maximum demand for the mains and sub mains. These calcs had to follow Australian wiring rules which are based on some sort of statistical analysis that was the hardest bit.
If i can add anything to the previous advice, yes get very organised, including getting a bit of a time line/gant chart going just for practice. I just use excel but i am sure others do things differently.
Write down all your tasks, initial time estimate, current time estimate to complete, time taken, etc.
Any task that you are really unsure of, have a crack at them early, as you cant have a good estimate until you understand the particular task.
Do spend a bit of time thinking about the tools you will need to complete your job.