Fastening of plywood for seat and backrest

Fastening the backrest. 

Started with drilling 9mm holes in the frame. Aimed to get the holes in a straight line and with even spaces inbetween.

Clamped the backrest and drilled 8mm holes true the plywood.

This is the M8 threaded hardware used.

Backrest installed.

The plywood is covered with mold protective coat of "saunasuoja" with brown pigment.

Next up for backrest and seat is upholstery.