I started on the side panel first, but then I realised it would be better to approximate the whole thing first, so I've just started doing that. my main ref is the
346XP. Once I get the blocking done, I'm going to break the model up where there are seams on the real thing (which I've already started doing for the side panel).
I've noticed other people only using double loops to sharpen their edges, but I read a while ago someone saying 3 is better because then you can control the smoothness of both sides. I'm staring to think there are times where you just don't need to have that much control, otherwise it gets unnecessarily cluttered.
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I was actually going to write about this in someone else's thread, but didnt get around to it.
Another side benifit is, you can easily take out the edges, and then add them back in if needed. Say you change the main edge loop and some other geometry around it, and now your supporting edges are messy. Simply select the loops, remove, and added em back in using loop slice(in modo) or connect? in max.
At the end of the day there is no hard rule about it, you just need to plan ahead and see if the benifits are good for how you plan to work.