I have access to one, but was considering getting my timber cut at the merchants. I'm finding it difficult to find a DIY store that offers solid wood of a sufficient size for the bottom. That is unless I use Ply, or veneered MDF.
That comes back to the question of glue etc, which is why I was keen to see what materials were used in an original drawer from a plan chest. If many were using Ply, I figured that would be ok for me to use it too.