Type the following line of code into the console..
exec("Add-ons/Brick_Large_Cubes/server.cs");
That should enable the cubes for that time you are on the server.. Just enable it when you restart the server.. If any pro scripter wants to correct me.. go ahead and do so. I believe that is correct though.
The house isn't the best I've seen.. nor the worst. I give this a 3/10. It needs more detail on both the interior and exterior.