Materials
42mm x 42mm x 2.7m pre-oiled Merbau lengths
Tools
Ryobi sliding drop saw
Ryobi hammer frill
Eyobi compact drill
Ryobi orbital sander
Clamps x 2 - essential
Ryobi nail gun
Exterior wood glue
Exterior 75mm timber fixings
Counter sinking decking tool
Steps
Step 1

Measuring up
Step 2

Drawing it up. I ended up going with a sub-frame design for strength.
Step 3

i lay out the cut lengths with spacers to estimate the correct number of lengths for the seat.
Step 4

I cut then assembled the sub frame
Step 5

Each lap joint is glued, pre-drilled and then screwed together for additional structural strength.
Step 6

The sub-frame is then attached to the lengths using spacers and the clamps.
Step 7

The final bench seat is then sanded and sealer applied. The seat is then dropped into the planter box which hides the subframe.