2x8 being resawed into 1/8" thick slabs for the inset panels.   Note I chose a section of the 2x8 with no knots, makes it easier to plane thin slabs.

I marked 1/8" + 1/16" = 3/16" from each edge of the 2x8.   Close up of resawing the mark, the slab is just to the left of the kerf.   If the 2x8 is a little cupped, I plane it flat before marking.  
BTW thats a Timberwolf 3/4" wide blade on a Jet JWBS-14DXPRO bandsaw.   Here is the page on my resaw guide.

After sawing off thin slabs I plane the remaining center of the 2x8 before marking and resawing off more thin slabs.  

Re-mark the remaining center piece (from the 2x8) for another resaw.   The two outside 1/8" slabs will become inset panel faces.

1/8" slabs after resawing, I try to select pieces where there are no knots (or small knots).   Unless knots are very tight and small, they break out when thin pieces of pine are planed.   If a small knot comes out when planed, you can sometime drill it out and plug it with a plug from a scrap piece, with matching grain.

Using a thickness planer on a 1/8" slab.   When I resaw a slab I cut it a little thicker than I actually need so I can plane off the bandsaw marks and to get to the exact thickness I need.  

Stack of 1/8" thick pine faces to make inset panels.  

After running the edges of the panels across the jointer I'm edge joining them.   The boards against the clamp faces are to prevent damage to the panel's edge, the other two boards (clamped down) hold the panels flat to prevent buckling under pressured.

Ditto for Susan's panels.  

Here is the edge of the pine face panel being edge joined.  

Two pine face panels after edge joining.  

These are 3/16" thick plywood backing panels.   I'll laminate them to the back of the pine face to make an inset panel.

Heres how I apply glue for laminating (from another project).  

And how I spread it out (also another project), note the bondo spreader from Walmart.  

Laminating pine face to plywood back.  

Edge of laminated panel, upside down, the plywood is on top and the pine on the bottom.   This laminated panel is 5/16" thick, 1/8" pine face and 3/16" plywood back.

One of Susan's inset panels being laminated.   These panels are same width, but 10" taller and the grain is vertical.
Note the two small wedges on top of the center pressure bar, they compensate for a little flex in the pressure bar.  

Several laminated panels note the pine overlaps the plywood, I'll trim it before gluing.  

On a different frame you can see the rounded outside edge and the rabbet inside.  

Back side of headboard with laminated inset panels being glued in.  

Front of foot board with laminated inset panels glued in.  

Betty's footboard with primer coat of poly, the headboard is in the background on the workbench.  

Headboard with primer coat of poly.   Note the little "fillet" at the legs under the bottom horizontal.   These will have the tee nuts inserted and glued that hold the headboard to the head boxes.