The tallit will be in and out of a tallit bag every time it's used, and will be subject to getting caught on everything around the wearer. I'd be careful about making it lacy for that reason. Knitting appropriate symbols (star of David, tree of life, etc.) into it would make for a beautiful tallit that would keep its shape and not wind up with a lot of pulled threads. Just a thought. Good luck....please post a picture of the finished work.
You are very right about that...
Here is a link to my friends store.. maybe you can get some ideas from her..