Main reason I have mine front down is so that the rear cap is easily accessible. My change process is remove the attached len swap rear cap over, drop into spare slot in the bag and finally attach new lens. It saves having to juggle lenses or use the "1 under the arm" methodWhy 'lens element down' out of interest? My bag looks pretty much like Dan's with lens caps off and lens pointing up! Even more so when I've one on another body in the bag ready to go.
Not really, a slight change to Chris's method and it's just as easy.Maybe it'll be easier if I wore a strapbecause currently I need to keep the camera in one hand whilst changing the lens...
For someone who's just dropped around £10k on 3 lenses, I'm surprised you're not more worried!