Metal Ladders would be redundant when you place it next to a stacked metal fence + Magnetizer (Which quickly pulls you up the pole when you're wearing metal boots.)
A glass door is interesting, though is this a purely cosmetic difference, or would there be something special with the door?
The main difference with the door is that you can see through it. I suppose one could simply replace the texture for the wooden door, but it makes little sense to craft a glass door out of wood.
As for the magnetizer? I don't use it in most situations, because up is the only option. Again, the main difference in a metal ladder is cosmetic - but an alternate recipe that is sensible increases a player's options and improves the technological feel of the mod and internal consistency.