The creators of the mod recommend the following:

Februus Depth (februus) by czg
Ripe with Decay (sm175_scampie) by scampie
Antediluvian (ant) by metlslime
The Horde of Zendar (zendar1d) by sock
Bad Dark Cistern (dm456sp) by negke

at the bottom of the http://lunaran.com/copper/download.html page (see "Pairings")

But I guess you can take almost anything that is not a mod (or doesn't require another mod and/or mission pack) and use it with Copper. 

Lunaran: email w/ misc bugfixes is sent. If it somehow doesn't get to you, please shout here to let me know. 

thanks for the list
Februus Depth was crazy hard on skill 1 :) 

how can I play the The Horde of Zendar? It has it's own game directory... 

the files in /zendar are just modified health pickups iirc. 

If I'm not mistaken...

Copper has a "pak0.pak" file W/progs.dat
Zendar has a "pak0.pak"+"pak1.pak" NO progs.dat

So... rename the Zendar files:

pak1.pak to pak2.pak
pak0.pak to pak1.pak

Then copy those into your Copper Folder.
PLAY Copper and then "map zendar" in the console!
Or if you use SQL select it from the list.

***ASSUMING you have no OTHER pak files in Copper other then the one that came with it. 

Doing it mfx's way is better if you want to just play the map once and forget it's there, but if you move all the Zendar pak files into /copper you'll be importing zendar's ammo treasure chests, so remember to get rid of it when you're done or they'll be everywhere.


Patch coming soon! 

Playing Zendar in Copper is "better" with ALL of Zendar's content!

But I should have put in what Lunaran stated. 

I ended up making a copy of the copper folder. Renamed the folder to copperzendar and added the pak files from zendar as damage_inc described.
Everything works. And since I want to replay only once, the new dir will be deleted afterwards. 

The Chthon fight was both very classic and very refreshing at the same time. Made me nostalgic for the glorious battles of old.

The levels are very chunky and old school feeling and this has much in common with Machine Games excellent classic Episode 5.

Some of the new mechanics seem cool, at least on paper, but I haven't really noticed or explored them in much depth. 

...is there an intended way to get to to END.bsp other than console command?

I played the whole thing twice and the portal (that I found noclipping) does not seem to open... 

 

end.bsp gives you the four runes you need if you just console warp to it - I had planned to take that out, but decided not to because I only wanted to encourage playing through id1, not to force you to.

Or, wait until I've got 1.05 ready and all the silly bugs in id1 copper that I missed are addressed. ETA still "pretty soon" on that. 

I didn't even realize that there was an end.bsp. I just played it. I didn't think that it could get better than the Chthon fight but it was amazing. Extremely creative and so much more rewarding than original fight.

Has anyone managed to find the prize after unlocking the achievement in the start map? 

Poorchop, the best hint I can think of while trying to avoid spoilers is:

Think about how e1m1 used to be -- the places you went, the things you did (assuming you found everything, did everything).

Now compare that to the new version -- there's something missing. That something is restored after the "achievement" is earned. 

...I had thought about that right after posting.
But I was pretty sure it was meant as an end to UDOB.

Great job, Lun.

The new END is something else!!!! 

missed the end.bsp remaster at first too, what a monster of a map! 

Missed it too. Checked it out, excellent. So that's where the boss2\sight.wav ("new" one) plays. For some reason with "earthquake" effect it's simple and... well, effective. :) 

That was the perfect hint, knew exactly where to look after reading. Thanks. 

Is copper compatible with the original Insomnia and the map jam? 

Would you be willing to integrate progs_dump and copper?
I would,but:
1.Lack of experience with QuakeC
2.Interpreted languages and errors are irritating...what's the point of reading code line by line when you could read all the files and point out all errors?
3.School.Goddamn IIT-JEE coaching.3d Modelling.My own project. 

Neither of them will work properly with Copper. They both use custom progs.dat files. 

I did give czg07 a try in Copper. Surprisingly, it worked almost 100% issue-free. Some ambient sounds don't spawn and make console errors, but that's all.

You'll have to manually tinker to move the bsp files around of course, just like Zendar. 

what does the custom prog in the map jam actually do? 

The insomnia jam was based on dump_progs, which is very different.