G'day Dave; nice to hear from you.
It's great to have Paul's website preserved; there is a lot of information there. As well as relating directly to the N2PK VNA, much of it is relevant to VNAs in general. The "non-VNA" material is similarly-valuable.
I still use myVNA with my N2PK; my VNWA is a fine instrument but the dynamic range of the N2PK is often useful.
Regards,VK2TIL.