1-18 is just like ours, but we have /webtop on p13, what do you have there? (p18 is our /sdcard and so would not be needed in a dump, nor would p16, our /data)
otherwise similar to: http://a-trix.net/wiki/index.php/Partitions
i've extracted atrix CG56 (boot.img) ramdisk and init.rc, attached to this post, please share your init.rc, *.prop, or just full system dump if you can.
whether Edgan's 2nd init hack will work (breaking in at mount_ext3.sh) depends on your particular init.rc and /system. also, we do not yet have a GUI bootmenu for atrix 2nd init. tenfar ported our CWM but i think others are getting the recovery built more or less direct from his git so you could port that somewhat easily.
if there is a translation of build.prop IDs to sbf filenames for your phone someone should detail that so the .sbf file can be pulled. (might be also depend on /default.prop from ramdisk) surely this is known by someone. otherwise a VZ employee should be kindly encouraged to leak it so you can dev safely!