LJ multichapter fanfic onto your ereader easily?

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I have a kindle touch and I am trying to figure out an easy way to get LJ Multichapter fics into one epub/mobi file. I already use the epub conversion website so that I can easily get all the chapters into epub - but I can't find a way to actually combine them into one epub file.

I have tried Sigil and I can't figure out how to make it do this even reading the FAQ it just keeps saving one chapter at a time, even when I try to copy and paste multiple chapters from the files.

Does anyone have a good way to do this or am I stuck either doing large amounts of c&p or just naming a ton of epubs as Series: # - Title/Chapter... or using Instapaper to capture them all if they are unlocked and not age protected and get them that way which is messy but does work too.

Also while I'm asking - does anyone know if they managed to figure out how to create collections on the Kindle Touch since it's programmed different than the older Kindles?? I had been following that on the mobile reads forum but it's pretty technical discussion :/

Thanks in advance! :)