Join Date: Jan 2019
Location: Central North Carolina
When working with solid wood (not plywood) it's best NOT to create cross grain joints ie. joints where the grain runs one way in one piece and the opposite way in the piece joining to it. As the wood changes in moisture content from day to day changes in the environment, the wood will change width in the across the grain direction much more than it will in the long grain direction. It usually doesn't take very long before the glue joint breaks, cracks appear, or the project warps (possibly all three). Finishing all surfaces with a good moisture proof finish helps considerably.
Orienting the grain the way that you show in the photo looks OK for all but the back spacer piece. You might want to consider making this piece differently, so the grain runs in the same direction as the other pieces.