well, if they are odd sizes you might want to look for solid so you can cut them down. I messed around with custimizing hollow doors in our prior home (from the 50's) it was no picnic...and those doors were a lot less 'hollow' than the ones they sell today.

Solid core doors always give a better impression if you're willing to pay the higher price.

But I'd stick with the sliding doors. Bifolds frequently act up.

I agree that bifolds act up but sliders limit the amount of space you can get at in your closet as well as how much light gets in.

Get solid doors. Whether you go with bifold or sliders. hollow core doors just give a cheap feeling. I am in the process of replacing the hollow interior framed doors and all the sliders with six panel solid doors.I went with MDF doors. They are heavier than h e double hockey sticks. They are a pain to carry around but worth it. If you go with bifolds or new sliders, get the hardware from Johnson hardware. they make some of the best bifold hardware and slider hardware. I used the bifold hardware in my old house about 10 + years ago after buying some of the cheaper bifold hardware and found it didn't hold up.

Here is a link that might be useful: johnson hardware

Before you settle on bifolds check to make sure that you don't have other doors and improtant walkways that will interfere with the folded open door. We have bifolds for all of our bedroom closets and our laundry closet. While I agree you get greater closet access than from bypass sliders, the bifolds are often in the way:

1. Our laundry bifolds open so that one of the doors blocks the door to the main floor bathroom.

2. Our son's bifold doors block his bedroom door so that either the person in front of the closet or the person at the door get a door shoved in their face.

3. The bifold doors in our master bedroom closets block the walkway at the end of the bed so that if someone accidentally leaves a door open at night, the night time treks to check on the babies or to the bathroom are treachorous.

My preference would be bypass or (better yet) pocket doors if possible.