Door Harcoding

[_-M-_]

I'm trying to make 1x2 and a 3x2 door mod. I've noticed however that how doors act seems to be hardcode (C#?) and I would like to know where I need to look/do to increase the object size. Also wish to remove the splitting effect of the doors parting, and simply have the whole door move to the side. thnx in advance!