It is important to check the renderings, because the quality of the different designers differ dramatically. There are very good designers, but there are also some, who ignore available plans or who upscale models designed for 1/2400 to 1/700 etc.
Shapeways is only a printing service, which host different shops of different designers. It is therefore not possible to say something about the designs (models) "by Shapeways", because there are non.
The issue with Shapeways itself is its rules, which forces the designers to make relatively thick parts. Shapeways can print much thinner parts, but want to reduce breakage...
Regarding the Barnegat class: there are two kits by Niko Models in 1/700:
USS BARNEGAT (AVP-10) 1941
USS ABSECON (AVP-23)1943
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