Follwed both the LDR and some threads on here, but can’t get it to work.
Part of the problem is nowhere is very clear, and we don’t have access to a source map that does such a thing.
If anyone can get this working, assume I am an idiot and do a step-by-step guide to everything - I’ve tried so many bloody permutations I really don’t know who I am or where I live 
Heh heh. I was just wondering the same thing with my 1024. I have never done this… and now I should…Can anyone help us?
How many stages do you want? I think you can have 3 build stages and 2 destruct stages (I’ve only ever done a 2 stage construction). I think I have something lying around that put in a simple map for you all.
I’ve got a 2 stage bridge for you…do you want it as a working map or just a prefab you can pop into a map you have?
prefab is fine - madmaximus has also pointed me in the direction of some rather helpful threads and prefabs (didn’t find 'em when I searched, need to be a bit more general in my search terms it seems), and I may take a quick look at them, but currently trying to sort out why my bloody map won’t load.
Thanks for the help though 
Here is a link. The bridge is from my map and I just threw it in a simple ‘box’ room. I hope it helps…let me know if you have any questions…
Thanks, with a bit of tweaking it did what I was after 
I’ve uploaded what I did to your map to make it work ‘my’ way, and then explain the differences:
http://theburrow.co.uk/et/bridge.zip
Differences:
1 - Satchelable (such a minor point, but might as well mention it!)
2 - Got rid of the missing entities and associated script lines 
3 - I noticed that you have it set so that dyno will only blow the bridge from fully blown if it’s placed on the end bit, IE the func_constructible. I felt this wouldn’t work in my map (note how regardless of what stage the fueldump gates are at, a satchel will blow in the same locations). This is quite possibly a design choice of yours, so I’m not going to say it’s wrong, just that my one I’ve changed how it works
I noticed you get some setstate errors in the console from your template, but this is most likely due to cutting from a working map and missing the odd bit. I tidied this up though.
Anyway, now I can see it’s simple, I’m trying to work out what I was doing wrong - but thanks for this anyway, helped me immensely!
Yeah, I was probably pretty sloppy deleting entities and script lines (the actual script is even more complex and I did delete some of them…) Thanks for cleaning it all up.
#3 - hmmm, yeah I’ll call it a ‘design choice’ …actually, I couldn’t figure out how to do what you are doing and can’t wait to look at your changes.