This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/hhb5VmRIVG4

I remixed another panel retainer from thingiverse, downsized it for 10 series extrusion, sized the holes in the bracket for M5 bolts.

These brackets approximately flush-mount (with a mm or two setback, which IMO looks nicer) 6 or 9mm baltic birch panels on 10-series extrusion, depending on which stl file you pick.