Ikea Hack: The 'Bertil' Bench

This 'able' is a Ikea Bertil chair hack/conversion that I have been wanting to do for a while. This is not my idea so to give credit where it is due: I found the idea on Pinterest which lead me to the original from a company of great up-cyclers: Junktion out of Tel Aviv. 
You will need basic woodworking skills and access to common woodworking tools. 

Materials:
Bertil Chair and Ikea supplied fixings/hardware
1200mm x 400mm x 22 mm plywood sheet
1200mm x 45mm x 20mm pine 
1200mm x 20 x 20 pine
Scrap bits of pine
PVA wood glue
Wood screws
Paint
Tools:
Jig Saw
Cordless drill
Tape measure
Screwdriver
'F' Clamps

Step 1: Halve the chair

First step is to gather all the parts of the Bertil chair, lay them out on a bench and cast your eye over the Ikea assembly instructions.
Work out which rails need to be cut in half.
Measure them to find the centre.
Mark out.
Check!
Saw them with your preferred timber saw.