Bostick's numbers would have been about my guess range for a decent fabricated fence, semi-custom. Obviously one can get into the "how long is a rope" question regarding a fence, though: Not every fence is created equal, even with a similar description.
Good (heavy) 10' cattle/ranch panels would run in the $ 13-16 range---and they're making those by the mega-ton including paint. Cheap lightweight versions run about $ 8/ft (just bought some Canadian made cheepies for that price). That's just for comparison of something which has similar construction---and high volume pre-jigged assembly-line cost-cutting build-up procedures.
If you want to pee yourself a little, you can go back to the old standards of about 1970 for pricing similar fabricated (custom) stuff: It used to run $ 20/lb from U.S. Steel. They'd not even bother to get into much detail because in those days, everyone made decent money and the game wasn't cutting to the bone. Trying to stab a competitor was the same as stabbing yourself in the long run. That's really how U.S. Steel supply would calculate jobs from bins to structural stuff to gate structures for commercial lots: Add up the weight, multiple by $ 20, put it on the quote.
Damn, I wish I could get away with that these days...and not even adjusted for inflation. And no, I'm not THAT old...my Father used to work for USS Supply and it always bothered him that the $ 20/lb rule he raised 5 kids on got tossed and replaced with cut-throat pricing.
