Did you say ships. Some were built using hides.
By the Way an individual can convert a fresh hide into leather.
Hide-covered boat
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I know all about hide boats. I know that nobody wants to admit that Clovis points trace back to Brittany France, because that is 19,000 to 26,000 years ago. It will mess up their land/ice bridge theory about native Americans coming here 12,000 years ago.
But, if you go to town and grab 100 random people, shoot a cow in the head, tell them to dress it and make leather out of that hide...I don't think the odds will be good for you. I can make leather and I do not want to fool with all that in a grid down. If you pull the pipe and oops it moves, break threads off in a collar...no store open to go get another piece of pipe. You're just like all the other replies. Still thinking power outage as opposed to grid down. Have you bought pipe lately? A 4" piece of 26.00 pvc now costs 165.00 before tax. I know you don't need 4" for your system, but other pipe is high too. Steel galvanized, whew is all I can say. I bought some 3/4" galvanized thin conduit a few years ago 35.00 a joint. I had bought several pieces of scaffolding but I didn't have X bracing. I have a 60,000# press so I made some. Most people don't have a vehicle that will handle an EMP/solar flare. Most businesses, including fuel stations, can't either. If one gas station goes out, you just visit the next one. If thousands go out, there ain't but a few guys that fix the electric pumps. And, that is dependent on IF they have power. Carrington event of 1859 burned out the #9 telegraph wire. There are a lot of wired things and computer controls (gas stations, truck stops), vehicles and tractors, parts houses, lots smaller than #9 wire these days. But no, since I live in the only land locked county in a land locked state, boats aren't useful to me for travel. There are some creeks that will get me to the Mississippi, but then I'd end up in New Orleans, and I definitely fer dang sure don't want to go there.