How to add a new block?

So recently I've been tinkering around with some KAG things and managed to find something interesting, a large wooden door in the files. I copied the sprite and cfg file over in to the door folder where the swingdoor.as and woodendoor.cfg files are. I tweaked the large wooden door cfg file a bit which is named LargeDoor.cfg. The only thing I really changed was the scripts and I made them identical to the wooden door one. I then added it to CommonBuilderBlocks.as and put it below spikes

Like this : -

Code:

{  // large wooden door
        BuildBlock b( 0, "large_wooden_door", "$large_wooden_door$", "Large Wooden Door" );
        AddRequirement( b.reqs, "blob", "mat_wood", "Wood", 60 );
        blocks.push_back( b );
    }

and doesn't seem to appear in the block selection inventory, any idea how to fix this?

 

I think that you should add it to a builder script

 

Which builder files would it be? Since there are quite a lot.

 

lol, finally a reply kinda ditched this project but I'll look into again and thanks kaizo :)