Lineage OS 14.1; Missing TWRP and 7GB of storage
I got it!

As instructed I flashed lp-kernel-14-03-CWM-for+ODIN.tar and using it's recovery installed then lineage-14.1-20180301-nightly-i9100-signed.zip and open_gapps-arm-7.1-pico-20180306.zip and that was all.

What I should do else is to install recovery-Lanchon-IsoRec-TWRP-2.8.7.0-20160113-i9100-(by-arnab).zip and addonsu-14.1-arm-signed.zip as long as custom recovery works, because after reboot it will be too late.

Now I have root and TWRP and will check what is up with big internal memory.