I agree, spend as many days as you can watching the coach being built. When I went they allowed you to stay as long as you liked after the tour. They did allow photography (they asked me to ask permission before taking pictures that include the workers, as some workers, Amish in particular, do not like to be photographed). This way you can get a really good idea of where framing, wiring, etc is located.
For my coach, wall framing was complete on day one. I do not know about timing of other steps as I was there only for the first day of the build.
For the PDI, I was able to stay in the coach on the dealer's lot for a couple of days (with full hookups) using the PDI lists I found on the internet to help me look for issues. Fixing the issues took another couple of days.
I did not take a video camera for the walk-through but that is an excellent idea.
To Ronnie's list, I'd add checking:
- Heater and A/C vent flow, especially ones that are not the main vents.
- Thermostat calibration, I'd suggest bringing a digital thermometer (our front zone is 3 degrees lower than the actual temperature). It's a lot easier to insist on replacement before you sign the papers.
- Undercoating (for missed areas, especially around the fender wells) - If you are at the factory late in the build process I'd suggest looking at it there.
- Molding fit and finish (especially the small (3/4 to 1") trim, it was not nailed well in our case.
- Paint issues, we had our coach delivered in the winter and the bay doors all had scratches on them. We documented all the finish problems with photos at PDI and later a local paint shop fixed them and had no problem getting reimbursed by Newmar.
- Run the furnace and water heater on gas at the same time and make sure the regulator does not freeze. I suspect we have a broken dip tube as the regulator still freezes up while running the water heater or the furnace for over 10 minutes.
Most of all, enjoy your visit to the factory (I brought my 8 year old son who enjoyed a big snowstorm while we were there) and your PDI, and don't worry if you miss some stuff, it can be taken care of during the warranty period.
Congratulations and good luck!
Stewart