Can I use transparent tubes instead of paper for the blade?

You can use rags instead. However, paper towels are not going to leave fibers behind that could later block your gun when it is in use, causing you to strip...

You can, it just won't be as flexible when you fold it. I'd recommend not adding stems, as that will put more weight on your flowers.

I don't think you should use a cast iron pan but it could work if you are desperate. I would definitely use a gas stove.

Yes. It will last far longer then cardboard..

Tape will not last as long as glue, especially a glue made for paper. There's no reason you can't use origami paper, though.

Yes, you can use any paper that is easy to handle (printer paper, construction paper, etc.). But make sure that the paper is a square and has equal sides (unless...