This Waterjet Nosil is intended to be an addon to a waterjet outlet with an outer Dia of 9.5 mm. This is not for the ProBoat Alpha PBK MK-II
The scale here is roughly 1:24
To be used with
https://www.shapeways.com/product/2UG53LANT/breakplate-small-scale-9-5-mm?optionId=110426271
The holes have to be drilled out to match your screws they are only pilot holes