So now the question of the day..... 9' bay area.... bike needs 7'3".... So bike all the way to the wall and leave 1'9" behind them or leave 18" in front? I kinda like the idea of having the bikes not right up on you and not having to move gear and crap to unload.... But at the same time stuff won't be as easy to reach if you have to reach all the way across from the sliding door..... hmmmm
For myself.. I prefer the bikes closer to the rear door.. That way when you are in either front seats you can grab a drink from the cooler etc.. Or move the stuff by the seats further back and then unroll a mattress and sleeping bag to take a quick nap.. Below is pic of our 2002 Ford E350 with a high roof (previous had Ford E150 cargo).. It came with a wheel chair lift (no ramp needed).. Good luck with the build.. Cheers