Hello,
I can model you and render that DNA helix with bolts. I am also a chemist, so I know what parameters DNA helix should have. I will do you that in 2 day max, and you will love the result, I promise! Let's get it done!
I have been visualizing different products with realism and quality and my clients always were satisfied with the result. If you are looking for some reliable and honest person who will not charge you until you are happy with the result then you just found one! Check my portfolio icon, there are few renders to illustrate the quality. Feel free to ask for any further particulars and get in touch if you are interested.
I am working mainly in 3DS Max and ZBrush and can deliver renders and 3D models of any complexity.
Sincerely,
Andrey.