Update time! Sorry it's been awhile.
The bright purple that van be seen on the clavicles, spine "buttresses", and top of the head is just the base coat for the Testors "Deep Pearlescent Purple" that was used straight for the spine (before drybrushing and washes). I hoping the purple will glimmer through some. Much of what I have shown are just test-fittings and much still needs detailing.
Aerodynamics is for people who can't build engines.