packaging a metaport

[Dave]

Hello,
    I'd like to compile and install xorg and gnome via metaports on a 
machine, making packages out of the entire process, including dependencies. 
My goal is to have a tarball that i can take to other machines, extract it 
and do a pkg_add * and have xorg and gnome installed via packages vs. 
recompiling the port. I tried a make package but that doesn't work with 
metaports, and make package-recursive doesn't happen either.
Thanks.
Dave.