/cgl/ - Cosplay & EGL

I made Gray Fullbuster's ice cannon, but I'm not really happy with the outcome. I want to make the handles round, but don't know how to do it properly, the actual ones on pic related are coming off, so you can't hold them.
I also need advice on how to add smaller tubes in the between the octagons and how to create them.

I made Gray Fullbuster's ice cannon, but I'm not really happy with the outcome. I want to make the handles round, but don't know how to do it properly, the actual ones on pic related are coming off, so you can't hold them. I also need advice on how to add smaller tubes in the between the octagons and how to create them.