Here is a merged DL of Antares creatures...

http://download.fliggerty.com/download--679

Would it be possible to merge all those esp's into one esp? I don't know how to myself.

Hmm, this isn't quite what you're looking form but I made a mod called "http://download.fliggerty.com/download-26-712". The description:

So, it actually works alongside his plugins... I thought I'd seen all of them merged together at some point. But I can't see that it got uploaded anywhere.

It's relatively easy to do yourself if you're interested. You can simply load them all up in the CS, go to the File drop down menu and click the button which says "Combine loaded plugins" then save it as a new .esp!

I'll do it myself... How would I load them up in the CS? Would that be File -> import data?

Nope, that's for something else. You just go to File->Open or File->Data Files (I don't remember exactly what it is called...) and then check on all the mods you want to merge.

I just followed this guide and merged them all into one ESP..

http://www.mwmythicmods.com/Archives/Mods/Merging%20Mods%20with%20the%20Construction%20Set.htm

Does it matter that I didnt have all the meshes/textures in my MW/data files when I merged them?