I think that this video deserves a thread of it's own! Published last year but it shows what these guys go through.
Wow that's pretty nuts about the engine swap and a bummer for Lyndon's result of second. I watched every single episode that Lyndon posted and really thought he did a great job documenting the experience for those of us who are watching from our computers. There was a moment in one of the episodes where he bought parts off the KTM truck. As much as I'm sure this is necessary it seemed strange for the Malle Moto class, or at least my understanding of the class. My understanding was that they had to carry EVERYTHING on them or in their parts box for the entire race. If that is not the case then maybe you could buy a complete motor, frame, suspension, etc. and swap it yourself during the race?? Sounds like this might be a grey area in the rule book.
Either way, I really LOVED the series and already can't wait to follow Dakar 2019 from my computer next year!!