I have a problem with almost all custom bricks. You can now go into a server and use them, but you will not be able to save this and load it into a server which does not have the add-on enabled. The only solution is to not enable it. Please think of a better mod that actually does something instead of taking a feature away from the game. All you did was change a few numbers form a standard pack to this anyways. A better idea for a brick pack would be something like space guy did where he made actual shapes and models and stuff with his bricks and the guy who edited whatever made the window bricks and added a custom model or two.
