Would have used model glue, but I have no idea how well it works on cured resin.
That's a good point. I print FDM PLA and I never considered using model glue. I wonder how it would work!
Thanks for the glue selection info though. I've been using Loctite Go2 and it's ok. I mostly like it because it's easy to cut any flashing off the joint where the glue is. The bridge looks great! It's pretty cool that it's functional as well.