No, Lestat isn't wrong about P81's having created an Enterprise-B model. Yes, he's wrong about it currently not being up for download.
Fetch it from here:
http://www.unimatrix-one.co.uk/knoxkitbashs/As for working in lesser versions of SFC, it should, at least according to my experiences. However, since it's set up for SFC III usage, the hardpoints will probably be off. You can also delete the damage textures...they won't work. And if your computer is graphically challenged...the 1024X1024 textures are going to be a hassle. If you happen to encounter texture size problems, simply fetch the lastest version of Paint Shop Pro at
www.jasc.com (trust me, MS Paint will ruin the textures) and reduce them to 512x512s.
Best regards & happy shooting...