No worries, someone else on this forum made a MOC recently and I used his idea for the mandibles... as i said they are completely re done from scratch - it took ages I actually re built them about 4 times over, as each time making minor adjustments.
I would rather not separate the mandibles at all though.
Cockpit quadrant was the biggest nightmare. i will try and separate it and see if i can take some photos that will be useful to you.
what engine area are you referring to exactly?