There's safety risks in everything you do. But, it can't be that significant when people buy their trucks with sunroofs already installed.
Anyway, I can't help with the search, but I do ask that you post pics when/if you get it done. I'm debating which mod to save up for next, and it'll be a while regardless since I'm broke, but I'm thinking sun roof would be it as well.
Good luck with the hunt!