I glued two flat walnut boards together for the bottom and cut a frame in beech for the tray. I routed a groove for the bottom to sit in and mitered the corners.
I drilled two holes for the handles and routed the rest out on my home made router table.
Had some burning but that cleaned up nicely.
Dry fit made me realize I needed to trim the bottom a bit.
Using the table saw I made two end pieces with cut-outs where the slats will sit.
While the tray was drying (boiled linseed oil) I glued the slats in the end pieces.