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A greenhouse is priced on gross covered area but earns only on the bed area. Beds repeat at a pitch of bed width plus path width, so the bed count is house width divided by that pitch, and cropped area is beds x bed width x house length. Utilisation of 65-75% is normal once paths and headlands are allowed for.
Bed layout
Pitch = bed width + path width; beds = floor(house width / pitch)
Cropped area
Cropped area = beds x bed width x house length; utilisation = cropped / gross x 100
0.4-0.5 m works for hand operations; 0.6-0.8 m is needed for a trolley or harvest cart. Cutting paths below what workers can use costs more in labour than it gains in area.
Usually yes — long runs reduce turning and simplify irrigation manifolds. Very long houses sometimes need a cross corridor, which costs a further 3-5% of area.