If it is a matter of aesthetics, then you have the wrong idea about a trainer. Of course you want your first plane to look good, but that is not the point. It's sole purpose is to teach you how to fly.
If it is a question of functionality, rubber bands beat bolts (even nylon ones) hands down on a trainer. They are a very useful safety feature, and you can still do very wild flying with rubber bands. They perform functionally the same as bolts while you are in the air, they only act differently when you hit the big round ball at the wrong angle <grin>.
If it is a matter of not wanting to mess with the pain in the butt of putting all those rubber bands on, then you are in the wrong hobby!