36 in. x 80 in. Composite Unfinished Flush Interior Door Slab

Yup! It's perfect for a desktop. I used a full length door, and trimmed down a second one.

I just bought this door and measured it. The specs are incorrect. The door is 1 3/8" thick.

if you cut it off evenly from both sides ,no problem

Yes, it will hold. I hung two on these door on a pocket door system two years ago. Still hanging as strong as the day they were installed. Very sold doors. Good luck.

I have 5 of these in my shop and beat on them and use them with hundreds of pounds of tools on them and i have never even dented these things before. I have legs on all my tables and casters to move them around and everyone that visits my shop wants to know what these tables are made of and i tell them they are home depot doors. And I purchased them as seconds that were water damaged and got an even better deal.

I wouldn't do it unless you have a way to finish the cut edges. Only the original, long edges have real wood stiles beneath the veneer; a cut edge will reveal the inner, bonded sawdust core rather than any real wood. You could theoretically glue a strip of veneer to the "raw" core edge. I doubt that cutting the door lengthwise would adversely affect the strength of the resulting pieces, but I doubt the door is designed to have a whole lot of "beam strength" anyway and I wouldn't simply lay it flat without supporting it underneath along its length.

Interesting that you say this is a hollow core door. The description says "The Steves & Sons, Inc. 36 in. x 80 in. Composite Unfinished Flush Slab Door has a solid core..."

You will need to visit your local Home Depot store for various special order size and style options from their local Interior door supplier.

No, it is not recommended that you use the door slabs for a bed platform.

Sure, but the veneer is relatively thin and rounding over the edge too far by sanding won't look very nice. If you just want to avoid splinters and make the edges nice to the touch, a light sanding should be fine.