To make the vertical slats, measure and mark eight lengths of 65mm dressed oak to 2.1m, cutting to length with a mitre saw. To make the top and base horizontal rails, cut the remaining 65mm piece into two 751mm lengths. For the middle horizontal rails, cut the 40mm dressed oak into three lengths of 751mm.
Tip: While you could make the cuts using a mitre box with a hand saw, a mitre saw will result in much faster, more accurate assembly.