Time:  0.5 hours Cut out clearance for corner braces and any other parts required. Place layer2 on top of layer 1 in plinth, checking clearance and fit. Remove layer 2, pillar drill and countersink three holes for fastening to layer 1. Check diagram for approximate locations. Place layer 2 on layer one, position, and drill shallow markers through holes into layer 1. Put double-sided tape on side of fixing blocks. Drop into gaps and press into place. Remove layer 2 then layer 1.  Pillar drill 1cm depth holes into layer 1 at the marks. Put layer 1 and 2 back into plinth and screw together.