Solid core plywood?  It had me wondering too.  I ended up using that in my last project, the sandpaper cabinet, because that was what I had available to me on the Sunday afternoon I went to start my project.  I hadn’t worked with it before.  I am still on the fence on if I like it or not.  I guess time will tell.  I also started a hand plane restoration which I was hoping to have done much sooner but apparently my immune system had other plans and I ended up being pretty sick.  By the way, I am a huge baby when I am sick.  I have no shame in saying it either.  However, the hand plane restore is coming along and I am very happy with the progress.  I can’t wait to see it done.