2 1 0   mm ▁how itzer . ▁However , ▁this ▁weapon ▁turned ▁out ▁not ▁to ▁be ▁available ▁at ▁the ▁time ▁and ▁was ▁therefore ▁replaced ▁by ▁a ▁ 3 8 0   mm ▁ro cket ▁launch er , ▁which ▁was ▁adapted ▁from ▁a ▁Kriegs marine ▁depth ▁charge ▁launch er . ▁ ▁In ▁September ▁ 1 9 4 3 ▁plans ▁were ▁made ▁for ▁Kru pp ▁to ▁fabric ate ▁new ▁T iger ▁I ▁arm oured ▁h ull s ▁for ▁the ▁St ur mt iger . ▁The ▁T iger ▁I ▁h ull s ▁were ▁to ▁be ▁sent ▁to ▁H ensch el ▁for ▁ch ass is ▁assembly ▁and ▁then ▁to ▁Al k ett ▁where ▁the ▁super struct ures ▁would ▁be ▁mounted . ▁The ▁first ▁prototype ▁was ▁ready ▁and ▁presented ▁to ▁Adolf ▁Hitler ▁in ▁October ▁ 1 9 4 3 . ▁D elivery ▁of ▁the ▁first ▁h ull s ▁would ▁occur ▁in ▁December ▁ 1 9 4 3 , ▁with ▁the ▁first ▁three ▁St ur mt iger ▁completed ▁by ▁Al k ett ▁by ▁ 2 0 ▁February ▁ 1 9 4 4 . ▁ ▁Due ▁to ▁del ays , ▁Hitler ▁did ▁not ▁request ▁production ▁of ▁the ▁weapon ▁until ▁ 1 9 ▁April ▁ 1 9 4 4 ; ▁twelve ▁super struct ures ▁and ▁weapons ▁would ▁be ▁prepared ▁and ▁mounted ▁on ▁re built ▁T iger ▁I ▁ch ass is . ▁The ▁first ▁three ▁production ▁series ▁St ur mt iger ▁were ▁completed ▁by ▁Al k ett ▁in ▁August ▁ 1 9 4 4 . ▁Pl ans ▁to ▁complete ▁an ▁additional