Also try in the Customizing section
@storm has been making theme's lately & would be a good one to talk to. There are several other's that have diff theme's/desktop enviroments, they maybe offline atm.
i think i covered all 4 question's, some answers are within the link's.
eg: do i install first & thing's to do.... there is alot to learn & master what needs to be done
Dear Ocka,
for example you don't talk about this.
Yes, I know Storm. He makes a lot of good themes (the red ones are pure magic, and I wonder if they work for KDE too... @Storm)
I haven't any luck getting my themes to work with KDE 
They always turns out blank and noone can tell me why KDE is behaving like this...
They work in GNome, mate, cinnamon, deepin (qt), xfce etc.
yes in this link
you will see specs needed for Core & Lite
first try in the first link
Then try searching for more similar topic's in customizing etc. 
Ok, but I'm asking (e.g. @Aravisian, do you know this?) if it changes something between the two editions, when using the same D.E.
It would have been useful to have full details of your "low end spec" machine to give a sufficient answer. As an example my good lady's machine, a rig I put together in 2006, is maxed out at 2 Gb RAM with a single core AMD Athlon64 processor and EVGA silent cooled AGP 8x 256 Mb nVidia card so can only run xfce version of MX-Linux and not the KDE version.
samsung sf-310
it has a nvidia card but it's unsupported, so integrated graphics, 4g ram, dual core intel i5 3rd gen I think.
I'm sure I can run kde, rn I'm on manjaro kde, but I cannot use anything but zorin. Should I download the core or the lite? then I'll install kde and use only that.
The only difference you would see would be the amount of space taken up on the drive.
Since you are planning to install a D.E., it is that D.E. that would determine the performance of the machine.
Core is a bit larger than Lite; so you may opt for Zorin OS Lite just to have a smaller base footprint.
Yes, this is how I would do it if it was me. It would be safer and simpler than modifying the .iso prior to installing Zorin OS.
I cannot think of anything particular that stands out as a warning. Installing Plasma D.E. is pretty straightforward.
Plasma runs more lightly than Gnome. This is likely most optimized in the latest Plasma version.
I'll install the kde-full package. Then, could I remove gnome/xfce?
I'll proceed in this way:
We're talking about Zorin os, of course I will!
I have a question... What about editing an iso to use kde and then putting it on the zorin site as an unofficial release?
Here is guide how to create kde, maybe it help.
Just used host Zorin.
Then when you finish i put here on forum remake Zorin and how create ISO with your build.
Here you have also some help Build LFS Linux From Scratch tutorial part one - January 2023 - 30894961 - YouTube
In the seconda video propably you can used command sudo apt install kde-full package.
This second guide working 100% i tested.
When you doing a compile kernel it is good idea to enabled zcat.
That help you more configuration kernel update or patch from a book Robert Love Kernel Linux Distribution and linux kernel i nutshell.
The instruction
Download Zorin Core.
Installing on hard disk. (1 host)
Create a VM install Zorin Core on Vm (2 host)
Install a ssh on virtual machine.
Then from instruction from links what i gived you start creating distribution and compile kernel.
Here is guide how update a kernel after compile.
How To Build Linux Kernel {Step-By-Step} | phoenixNAP KB - not tested
I found also on linux mint guide how from virtual machine what you created you can build your own image.iso with choosing which package you want install from example Zorin. Mint and Zorin are ubuntu then guide is the same the diffrents are desktop enviroment.
The best option to compile a kernel are processor Intel Xeon E7 or Intel Xeon E5-2697 V2 or Xeon E5-2695 V2 and some good size a ram.
The people talking best tool for creating distribution is that tool.
Remastersys download | SourceForge.net
I will also tried kde with Zorin and gived you printscreen but my hard disk isn't fast but will do that. When it long download and compile best way is.
I Hope it not burn my pc when i do that.
