Brian--I think your set up was fine. I too would not worry about a ricochet in your stand. Looked to me like you had plenty of room. The video that NevadaZeilmeister posted was apples to cantaloupes...a guy shooting from a standing position at something that we cannot identify in the video and then comparing to your stand, well, for me there wasn't much to compare. If you are worried about a ricochet how would you ever take a shot? Unless you are getting a coyote to freeze right in front of a 20 foot high dirt backstop, no one ever knows 100% about what is/is not out there. We do the best we can to hunt as safely as we can. You made some good points about how far bullets travel and that is if we fire them at a max angle, not after striking the ground. I had no problem with your set up.
As for hunting close to buildings, I do it all the time. Coyotes love farms, neighborhoods, etc. Gotta go where the coyotes are.
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Mama always said, coyotes are like a box of chocolates...