This is probably a question for Tesla once I get invited to configure, but does anyone know if it's possible to modify your configuration before taking delivery? My delivery estimator currently says Dec-Feb for the LR, so it's looking very possible that I could get invited to configure before the end of the year. I'm planning on configuring a SR, but I'm due for a promotion in January that could make the LR a much more comfortable option financially. I'm wondering if it would be possible to change my SR configuration to a LR if I do it before my car starts being assembled, even though that would probably push my LR delivery back.