▁a ▁trip ▁to ▁Italy ▁with ▁his ▁employ er , ▁Duke ▁Anton ▁Ulrich . ▁It ▁has ▁also ▁been ▁reported ▁that ▁he ▁was ▁unable ▁to ▁draw , ▁leaving ▁the ▁details ▁to ▁his ▁assist ants . ▁All ▁of ▁this ▁has ▁been ▁disput ed . ▁ ▁In ▁ 1 6 8 9 , ▁he ▁became ▁the ▁first ▁Royal ▁" B au v og t " ▁( Build ing ▁B ail iff , ▁or ▁Ins pect or ) ▁in ▁Wolf en b ütt el ▁then , ▁in ▁ 1 6 9 2 , ▁the ▁" B au ver w alter " ▁( Build ing ▁Administr ator ), ▁working ▁in ▁co operation ▁with ▁the ▁Land ba ume ister ▁( Master ▁Bu ilder ) ▁Johann ▁B alth as ar ▁La uter bach ▁( 1 6 6 1 - 1 6 9 4 ). ▁K orb ▁took ▁over ▁La uter bach ' s ▁duties ▁after ▁his ▁death ▁and ▁completed ▁many ▁of ▁his ▁projects , ▁which ▁had ▁l angu ished ▁because ▁of ▁his ▁long ▁ill ness . ▁However , ▁K orb ▁wasn ' t ▁officially ▁promoted ▁until ▁ 1 7 0 4 , ▁when ▁all ▁of ▁his ▁work ▁was ▁being ▁done ▁from ▁his ▁own ▁original ▁designs . ▁ ▁Const ruction ▁proceeded ▁at ▁a ▁fast ▁pace ▁during ▁his ▁ 4 0 - year ▁ten ure . ▁Many ▁of ▁his ▁structures ▁no ▁longer ▁exist ▁because , ▁following ▁practices ▁that ▁were ▁common ▁at ▁the ▁time , ▁they ▁were ▁cheap ly ▁built , ▁with ▁wood ▁pan els ▁designed ▁to ▁im itate ▁sand stone , ▁and ▁quickly