Hello Bigford!
Perhaps not the best answer, but someone else will surely come to rescue. I read on a danish site about a guy who built the p.o.f kit. He says it's in a smaller scale than the plastic hull one, so you are probably right. It's worth a visit to this site as he has built a lot of Billings kits to a very high standard, very informative also.Don't have a link, but google "Soren Kjaer Nielsens" and you get there.
Hope this helps!
Hama