Image builder turris omnia what is the size

I tried a year ago to have more than 512Mo on my Turris omnia
I has the same issue this guy had

My last try was to build the image myself with 8Go with the size of the disk (didn't manage but I'm willing to try again)
I found this tool
If I select my hardware, does the size of the partition match the hardaware ?
or If I want to use the 8Go I still needs to build the image myself ?
Thanks for your help