To make the brick settlement you can use white glue, settlement mass or even a mixture of white glue, mortar and water.

1 - Apply 2 thin threads for layer;
2 - Rise 3 layers on the edges and endas of the walls, upending for the line sustenance;

3 - Remove the residues with brushes before apply the glue or pass a broom at every layer end;

4 - Follow all the walls in the same height;

5 - Check regularly the distance of the doors void;

in option of make a half brick in the construction site, make use of circular with buzz-saw or hand-saw;