Well, I got a stupid situation here, even though I'm on official lineageOS I wanted to re-partition the table to be able to flash nano GApps, it all went smoothly along the explanations outlined in post #1, however after flashing the latest lineageOS build and returning to TWRP's advanced wipe section to change partition size of /system before flashing the bigger then usual nano GApps, which works perfectly as after the procedure checking /system size it's notably larger but still the open GApps installer aborts installation because package exceeds the partition size, which does not make sense by checking & judging from the numbers TWRP provides...
Would appreciate any help, I ran the logging tool and would want to share it, just didn't found where it's stored yet - I of course did try it several times by wiping all installed partitions (even formated all partitions individually as suggested), then flashing ROM and resize /system before doing so, still GApps aborts the option...
Edit: also using version 2 of the re-partition script!
So I can't figure out what I'm doing wrong here, only thing I did was restoring data from my previous old partitioned backup, may this be responsible for breaking the whole process?
Haha, right after posting here I saw that I unintentionally also copied a "open gapps" folder to the internal storage that had instructions to just perform a test installation / space calculation, deleted the folder and all is functional and fine, sorry for bothering, it's definitely on my side and your procedure is super easy and brilliant!
Thanks for the work, the sharing and supporting...
@rhmt1210 no, this layout is fully compatible with any custom ROM, just resize system after ROM flash before GAPPs install