What I did for my bacon taco shell was start with a square bacon weave that used about 14 slices of bacon, or seven going in each direction. I then cooked the bacon weave in my oven at 400° for about 15 minutes before taking it out, patting it down with paper towels to get rid of the excess grease and then placing an upside down bowl over it and tracing around it with a knife until I was left with a circular bacon weave.
After that I hung it over a couple kabob sticks that were balanced across empty beer bottles and left it like that for a few minutes so it would keep its shape. I'm sure that there was probably something better I could have draped it over, but you've gotta make do with what you've got right?
Since I wasn't quite sure if beer bottles were safe to put in the oven I swapped them out for a couple pint glasses, put them on a baking sheet, hung my bacon weave taco shell between them and slid it back into my oven for another 10 minutes so it could finish cooking.