How to build a ledge door?

If you're referring to cutting a regular door almost in half or about counter height, then you're referring to a "Dutch Door". First, you'll have to make sure the door you want to transform this into is a solid core door...Only because you'll need this for support once the door is cut. If you're planning on cutting a "slab", or smooth door, simply cut it where desired. If you're cutting a "raised-panel" door, then you'll want to make the cuts on what is called the "stiles" of the door. You see, the stiles are the shorter, horizontal boards that interconnect with the "rails" , the longer, vertical boards. Cutting on these stiles requires less work overall. Before you cut the door, make sure that you allow for the thickness of the shelf that you use...This is only necessary if you place the shelf over the top of the bottom section. Now, if you were to attach the shelf onto the top, but on the side of the door, then you wouldn't have to allow for this thickness...Another thing to consider is that you'll be needing to bore out an additional hinge on both sections of door. Other than that, this is how I fabricate a Dutch Door. I must warn you, this is a very hard project for a do-it-yourselfer. If you have some creative skills then you shouldn't have a problem. It's bad enough that door hanging is a cl all its own...I've known many excellent finish carpenters that couldn't even begin to successfully hang a door.