HI Quil,
Well since you live in AZ, you most likely do not need the warmth so much. Yes it is a must to sew with a ballpoint needle. In some thrift stores you can still find the old polyesters. I have apile I just washed... I have been gathering to make some more camping quilts. You can not distroy them.
I would NOT even attempt to put it on the long arm to quilt.
All the stretch, and since it is stretchie already, that is the kind of a binding I would also put on it. Tee shirt knits are wonderful for backing them. And I have always tied the ones I have made throuh the years. Good luck in finishing. and also I wouldn't even bother putting a batting in it, just the backing, for they are so heavy already. Just my thought's , hope we have all helped you. Yes I agree this is a wonderful place to ask and get the best ideas.... Many more miles of Happy Quilting,Connie