Can I cut a hollow core door much shorter?

Sure, cut it, chisel out the cardboard hollow core crap. Rip a new stile from 2X on a table saw and glue it in.

Yes, I’ve done it. As said, rip a piece to fit inside, glue it and shoot it with a few finish nails.

Will give it a try. Will have to try to find a strip for the bottom or cut one by hand. Got rid of my table saw.

As previously suggested, cut the door as needed, remove the stuff inside. But you don't need to find another strip, the one you cut off is already the right size! Simply use a putty knife to remove the this outer wood, knock the pieces off the ends, glue and put back in the new bottom. A couple brads will keep in place while the glue dries.

Done this a few times, works like a charm.

Will try it.

Sho do !!!

Want to add something NOBODY has mentioned so far.

Before you cut the door, especially if using a circular saw, after you determine how much to cut, pencil in your cut line and use a straight edge to take a utility knife and score that line with at least 2-3 passes to cut into the door surface.

Then when you cut the door, keep the circular saw blade just shy of that line on the waste side to prevent the blade from causing tear-out of the doors finished surface.

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Also, apply painter's tape to the door where you will mark and cut

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Solid advice, especially if using a circular saw