Here are some more pictures and details on this build:
The "trunk" of the tree is 5 foot long PVC pipe 1/8 inch thick, 1 and 5/8 inches outside diameter ( I ended up cutting the trunk down to 4 foot 2 inches, 5 foot is too tall). The "branches" are 10 foot long pvc tubing 1/2 inch diameter. The hole in the tubing should be big enough to slide over the drywall screws
I bought three 10 foot lengths of this tubing and cut them into 6 inch sections. 60 branches for 60 bottles.
The screws are 2 inch drywall screws with a tight thread (screw theads close together) and they are about two inches apart. I predrilled the holes for the screws at a 45 degree angle. I broke two drill bits doing this because I started drilling with small bits. Use a bit that is as close to, but smaller than, the drywall screw diameter as possible and you should be ok. I screwed them into the pipe just far enough to where they were in there good and tight, but not too far in because they still need to support the tubes and bottles.
I started the screws 6 inches from the bottom to leave room for the stand, which is just 1 foot long 2x4s nailed together..see next post for picture at my limit of 4 pics for this post