Looks cool Kva.
Slacker is pretty good at mapping.
We do have SlackerLife when he's around.
I have no experience with GUTS' level editor, but I used to make maps for SC1, SC2, and WC3.
I plan on making maps for my upcoming project, The Lure of Ember. I'll try to write up some tutorials if I figure anything out.
Calling
@Slacker 
! Got any tuts for us pls?
(I know nothing of level-making either guys, sorry)
Slacker has some YouTube videos. I'll try to put up some as well, once I figure things out a little better.
What's WC3 (pardon my ignorance)
I know my way around mapping in GUTS well enough if you have any questions...
Hey Gorogorosama! Welcome!
Thanks for offering to help. If you want to make any tutorials, that'd be awesome. Personally, I've done so little level editing I don't even know what questions to ask.
WC3 is Warcraft III.
Now I have an idea to create a city. I want to use a hybrid method: 3D-models + skybox. Ie in the foreground are placed real buildings, and in the background - image with buildings.
It should look something like this. I tried to clone blocks - thus it is possible make a huge city.

Need to add different decorations and stuff, but to begin looks fine.
The background should look like this:
Thats actuallt a beautiful scene Kva! Is it for your Dark Palace mod?
Well, I want to make the character creation screen. Start of a journey happening in the Imperial colony in a big city. Another goal - is the practice of creating levels.
Levels are really time-consuming to create...
This is the biggest hurdle for me in LoE right now.