Uchiwa

I'm planning to make one or two....but before I start, I need some help on these:

1. What's the limit on size? I remember reading that the max size is the official jumbo uchiwa size ne.
2. What's the limit on materials? Are there any? Like no sequins, lite sticks, 3-D items yada yada yada...
3. Anything else to note?

Arigatou in advance!

( Transfered comments under the cut )