Increment CM digits are always no task at all because developers are taking good care so that flash process is done right.
But when try to decrements cm digits - do not have options. Back to DDLF2 via mighty odin is the only way to start. No flash-able zip files to step back! There should exist some easy way to do the job. This is a way to do this but I believe more easier way exists.
From cm11 rebboot to recovery
Flash cm-Ker-10.2over11-BuildBox.zip from cwm
Reboot to recovery again
Clean user data, etc, etc
Flash any cm10 (I tried cm10.2) rom
If that well known error "status 7" appears go ahead and flash again.
Flash gapps accordingly (gapps for 4.1, 4.2, 4.3)
Yes, not caught by mighty odin. Bye bye odin. See you later in deep needs.
This is not my work. I moved things from here to there. No Dev thing.
The zip structure is taken from the work of David Rodero
The boot.img is from BuildBox
All credit goes to @rodero95 and @buildBox
Finally, good luck to all flashers.