The S-IC first stage arrived by barge on March 13, 1967, and was erected in the VAB four days later, with the S-IVB third stage and Instrument Unit computer arriving the same day.
The S-II second stage was two months behind them and so was substituted with a dumbbell-shaped spacer so testing could proceed.
This had the same height and mass as the S-II along with all the electrical connections.
The S-II arrived May 24.
It was stacked and mated into the rocket on July 7.

Testing was slow as they were still checking out the launch vehicle for Apollo 4, a limitation of the system where there wasn't two of everyone and everything.
The VAB could handle up to four Saturn Vs, but could only check out one at a time.

The CSM, a Block I model, similar to that flown on three previous uncrewed tests, arrived September 29 and was stacked December 10.
It was actually a hybrid of two production spacecraft, consisting of CM-020 and SM-014, since SM-020 had been destroyed in a tank explosion and CM-014 had been dismantled to support the investigation into the Apollo 1 fire.
After two months of testing and repairs, the rocket was moved to the pad on February 6, 1968.
The S-IC first stage arrived by barge on March 13, 1967, and was erected in the VAB four days later, with the S-IVB third stage and Instrument Unit computer arriving the same day. The S-II second stage was two months behind them and so was substituted with a dumbbell-shaped spacer so testing could proceed. This had the same height and mass as the S-II along with all the electrical connections. The S-II arrived May 24. It was stacked and mated into the rocket on July 7.
Testing was slow as they were still checking out the launch vehicle for Apollo 4, a limitation of the system where there wasn't two of everyone and everything. The VAB could handle up to four Saturn Vs, but could only check out one at a time.
The CSM, a Block I model, similar to that flown on three previous uncrewed tests, arrived September 29 and was stacked December 10. It was actually a hybrid of two production spacecraft, consisting of CM-020 and SM-014, since SM-020 had been destroyed in a tank explosion and CM-014 had been dismantled to support the investigation into the Apollo 1 fire. After two months of testing and repairs, the rocket was moved to the pad on February 6, 1968.
Apollo 6