'manually-constructed' originates from Latin, specifically the word 'manus,' where 'manu-' meant 'hand,' and 'constructus,' where 'con-' meant 'together' and 'struere' meant 'to build.'

'manus' transformed into the Old French word 'manuel,' and eventually became the modern English word 'manual.' 'Constructus' evolved into the English word 'construct.'

Initially, it meant 'built by hand,' and this meaning has largely remained the same in modern usage.