1. as much as you can, stop by your local game processing place this year during rifle season if it not already over, i just did this a couple weeks ago. they had a dumpster out back with 400+ deer legs in it. now thse legs were mixed in with all the other carcass parts, and i didn't feel like wading through that so i just picked off the top, i got 20+ of the biggest rear legs whitetail sinews i've seen. whats nice about this is that with so many to choose from you can be picky. Also, get your rifle hunting friends to gather all the deer legs from deer camp, i also did this and got a bunch more, but i had to split them with sailordad
(above post), did you get yours yet tim? i stripped mine last night, and they are drying now.
2. can't comment yet, i'm just getting ready to start my first.
3. i shot a sinew backed red oak this summer that a friend of mine made, i liked it a lot, it was a snappy little shooter. i think it was only 48" long and about 40 lbs, but it felt like it shot pretty fast.