A few photos of construction details.
Apart from those anchoring the V-frames to the sides, screws were used only in hidden areas, namely the filler behind the front flap and the lower V-frame joint with the bottom.
Drilling dowels for the upper V-frame mitre joint.
Setting out V-frame and bottom mitre joint. I drilled a 5-dowel joint between upper and lower V-frame elements.
Fitting “top” side before marking out V-frame dowel positions.
Squaring across marks and centring at 9mm.