Why a large slipway was insufficient for Dutch battlecruisers

Why would the Netherlands build its planned battlecruisers abroad?

Dutch yards lacked the established capability for such large, complex warships, making foreign construction an alternative to building that capability from scratch.

A yard could be large enough in theory yet lack experience in constructing a battlecruiser. The proposed ships exceeded the scale and complexity that Dutch yards had developed the infrastructure to handle. That problem applied to the plans before the First World War and again before the Second. Ordering abroad had to be weighed against the cost of creating the required domestic capability.