These parts, remember, are going to be large enough that any kind of land transport would be rather difficult.
The 737 sections transported by rail all travel as "High/Wide" railroad loads, and require extra special care in terms of planning due to width and height restrictions.
For instance, ANY bridge they go over, they have to go at 5 mph, with the engineer and conductor watching behind the engines to ensure proper clearance.
(That in itself is a pretty funny regulation, as these trains have 5-6 engines and you can't even see the loads anymore once 1-2 engines are stretched around a curve or bridge)
Not to mention the routing changes that have to take place to ensure they don't go through any tunnels, bridges, etc the loads won't fit through.
Now expand that cargo size to something the size of a 787 fuselage.
Instant headache ...
On an airlift alternative ... if Boeing got the US Military involved, would these sections fit in C-130 or C-5 aircraft?
If they would fit, I'm sure in a pinch, a deal could be worked out for the airlift wings to get some flight practice in w/boeing picking up the fuel costs ... or somesuch ...