So, after having gotten a little familiar with Ubuntu, and really not liking upstart, I'd be glad to see what can be done with ubuntu-builder. But, ladies first!!
Hey, I'm even doing my first custom plymouth theme.
Ah!! A plymouth theme! Then you might be able to help me with that in the future?
Ok, about Lubuntu and Xubuntu I suspect they contain some special tweaks which need to be known in order to handle it perfectly. I also suspect one part of the Ubuntu Builder to need the right naming provided... just a new idea that came to me. I am fully involved in that for the time being, I feel an urge, perhaps a bunch of old machines coming around me soon, to provide with an easy/nice/light spin?
If you want to make razorQT on top of some Ubuntu... my bet is that the version I put online under the name RC3 might start to be pretty fit for it.
Just don't change the naming and brand in Ubuntu Builder, and you should have a boot going straight to the desktop. And zram-config works perfect there, in the Live and after install.
While I am here: I had to cheat and add it to rc.local for it to be up and running. I have noticed in Madbox, it is up and running, in the live AND after install : but I have no idea how he did that ! I would be happy to get some help to try to find out how it was done, because it is probably more elegant that the method I have used...
(You will also have a look in /usr/share/initramfs/... some compcache file I don't remember where, and in /etc/initramfs as well, I have used the information from the comments to fix the size and have able to run).