Great video. It gives a good appreciation of what is involved in a re-power job.
I've recently finished my re-powering job. Much smaller single engine but it still involves so many tasks in small spaces. My son & I did the lot, other than operating the forklift.
Take note of one very important step if you are re-powering. Prefitting. The model engine they use for working out engine position and angle can save a lot of heartache. I built several out of scrap wood, allowing me to "trial fit" several models of engine before buying. Well worth the time.