Ran a little experiment - glued two walls with first the gorilla glue and then with 2P-10. After cure I dropped them on the floor. Both test samples broke apart. Alan Graz is correct in saying that something else is needed like hot glue to reinforce the joints.
If you are building for your own layout the hot glue is probably not necessary but shipping stuff is a different story. I like building Korber kits but I hate shipping them.
Joe