On Sat, 21 Jan 2017 21:37:36 -0600, Martin Eastburn
wrote:

If you are buying a stack-up type - consider a Metric. Ply is metric
and is sloppy in Imperial stack-ups. I got a nice set that with the
complex set of shims I have both Metric & Imperial. Look at the box and
pick the right set. More is better.

Consider using older wood and newer wood....

I don't think it matters. You have to measure and use shims, in
either case.