I don't know if they will put something that large together, but Lego does have a program that you can download called Lego Digital Designer.
They have all the different brick types, colors, etc. You design what you want (easier said than done) and when you are satisfied with your design, you can upload your design to the online gallery. Also, there is a feature that will allow you to price out a kit for what you designed. I don't recall what the wait time is for your kit to be built and shipped to you.
Of course, something as large as the carrier would be prohibitively expensive, but as Lone Wolf said, one can dream, can't he?