Read the comic here.
I had planned to have the house's weapons come out of doors/ports on the building itself, but I couldn't get the angles to work right. So these weapons came up out of the lawn like vengeful lawn gnomes or something.
And, yes, the lawn that travels with the BH is very, very thin. But the Brick House has teseract technology, as you'll recall. Big things can fit into small places. So just relax and go with the joke.