Here is you best bet at this time is Norbert Rouch Models. You will get short kit from Norbert that will include Nose section, tail section with vertical fin and engine nacelles out of fiberglass, you will also get templates to for wings and stabs to cut them out foam yourself or get them from one the listed companies as pre-cut parts. Rest will be up to you to build it from there onwards to completion.

Take a look: http://rauch-airliner.com/B737E.htm

Sam