who was responsible for its design?
NV Ingenieurskantoor voor Scheepsbouw.
Design 1047 battlecruiser
 With their assistance (mainly through NV Ingenieurskantoor voor Scheepsbouw), a rough design was formulated by February 1940. 
what is design 1047 battlecruiser? It was a series of plans for a class of Dutch battlecruisers.
wiki:14197827
Design 1047 battlecruiser [SEP] Introduction
A visit to Italy prompted a rethink of the internal layout, which led to a set of drawings dated 19 April 1940. This is the last known design produced prior to Germany's invasion and occupation of the Netherlands. Final plans for the ships were never completed, and the ships were never constructed.