No problem
I did mention in post #3 above that it would be easy to swap the "big gun" to the outside of the bag, with the little'un stuck at the back. I don't think that makes my arrangement any less capable than the more conventional format, which also only makes one body/lens available for quick access.
Personally, I like to have two bodies ready to go, one wide and one long, rather than repeatedly swapping lenses. I'd more than likely drop a lens while frantically trying to swap them over while in the field (no handy table top) and at the same time trying to avoid dust covering everything. If I'm shooting seriously rather than just wandering about the camera(s) will be out of the bag anyway, one round my neck and one on my shoulder. It's just nice to be able to shove one or both back in the bag with no fuss and no disassembly of kit.
Sometimes, say for a zoo trip, I might have my 100-400 on one body and my 70-200 on the other. With my bag configured as it is I can easily fit one or both away when not needed. I think my arrangement makes for a much more versatile, yet compact, solution than the "normal" way. If the bag was configured the "normal" way I would have to dismount both lenses in order to squeeze everything in the bag - or get a completely different bag. I like compact. I like quick. I like dust free. I think I get those things with my SS 200. I would not want an SS 300.