Building a Bee Nesting Box

I have using 1x10" dimensional pine for my nest boxes.  Each piece is cut to 6".

I am clamping together 6 pieces for each box.

I am also making marks at every inch longitudinally for future drilling.

Then, I begin the drilling process at every mark along the seams of the 6 pieces  of wood.  I am using drill bits from 1/8" to 1/4" for the nesting holes.