[Q] Adapting a ROM to resize applications partition - Android Q&A, Help & Troubleshooting

Hi,
I have buyed since 1 year ago a Huawei G740. Due i think to less owners, there is no custom ROM like cyanogen. Ok for me.
BUT this phone is selled with a stupid internal repartition: 7GB for user and 1GB for applications.
I dont want to use link2SD or other solutions, because i want my phone to be usable without SD card.
I think i understood that it's not like a classical OS (Linux distribution, windows...) and you cant simply resize the partition with tools like Gparted. Right?
You need to adapt your own ROM to set inside the partitions size (with address and offset?) Right?
A new update (this summer) has been released, so i wanted to do it myself and just adapt this .bin to set new partitions size.
do i be in the true way?
I found some explanation on the forum to make a lot of modification in a rom extracted from the phone but nobody speak about size of partitions except for specific phones (not mine) and nothing generic.
Can you please give me links to learn how to modify partitions size of a ROM?
Processor is : Qualcomm MSM8930 Snapdragon 400 Dual-core 1.2GHz, android version is 4.1.2 (dont know is it matter)
Thank you for answers
Yann.
PS what i found:
http://forum.xda-developers.com/showthread.php?t=1661770 (but nothing about resizing)
http://forum.xda-developers.com/chef-central/android/guide-android-rom-development-t2814763 (but nothing about resizing)
http://forum.xda-developers.com/showthread.php?t=1684318 (but no answer)
http://forum.frandroid.com/topic/155072-tutoliquid-e2-etendre-sa-partition-data-a-15225go/ (but for E2 phone)
http://forum.xda-developers.com/showthread.php?t=711841 (but for HTC)
http://forum.xda-developers.com/showthread.php?t=806321 (but for HTC)
http://forum.xda-developers.com/showthread.php?t=704560 (but for HTC)
http://forum.xda-developers.com/showthread.php?t=2712253 (but for Xperia)
http://forum.frandroid.com/topic/185279-topic-sur-ascend-g740/ (G740 french topic)
https://usersfiles.com/veovc4j6wo2m (the new rom update)
PS2:
Sorry for my english (i'm french )

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