Ahhhh.... baaaaa... you made me laugh Gordo, I guess I never thought about the window issue. You mean you guys don't have roll up windows? 
... duh I really wasn't thinking about the model, eh, manufacturers differences at all.
Speaking of IM, I just heard from Robert that they are now back in full swing at producing IC cars and i would think if you want to get one of the final IM-IC cars I would go for it now, as the window may be closing if the E-cars take off.
In any transition time it might be wise to have some contractual language inserted in the contract in case the build lasts forever... just saying.
Come to think of it I would insert such a clause in any new build, but that is just me.