I can appreciate the need for caution and good planning before any project. But I'm not sure I see the concern. I know that not everyone is mechanically inclined (Dave, I don't know if you are or aren't...just speaking generally). But there are those of us who can visualize a project and know exactly how to get it done.
I enjoy seeing what creative, handy people do to their rigs with out-of-the-box thinking. I do all of my own projects and enjoy the process of making our camping experience better, easier, safer, more enjoyable, etc. It wouldn't be the first time that I've sourced better screws or bolts to attach some widget that came with cheap ones.
I'm sorry if this sounds like I'm scolding the concern...I'm not. I'm encouraging the OP to git-r-dun if he can SEE his way through this project. I completely agree that if a person can't see, or just doesn't know how, to get something done then yes...seek advice from someone who does. But if you can, and do...then enjoy the project.
OP, this sounds like a pretty straight forward project. If you know what you need then I've had a lot of success finding it on Amazon as well as local hardware stores...even big box stores. I find that my local ACE is also a good source for onesy, twosy kinds of hardware. Good luck