Setting fixed size screen resolution in Arch VirtualBox guests...

Hello everyone.,
I've installed an Arch Linux 64-bit guest os in Windows 7 64-bit host. And i've also installed guest additions succesfully.
Now I need to restrict X to 720x1280 (720p) screen size for screen capturing.
I've already tried few methods for resizing it:
1) Tried disabling AutoResize in VirtualBox.
2) Tried to hint the display size in global settings (VirtualBox => File => Preferences => Display), but when I enter X it fits automatically the whole window again.
3) Tried to write a configuration file in "/etc/X11/xorg.conf.d/90-monitor.conf" (as explained in Xorg wiki page), but it still doesn't work. I couldn't find my monitor Identifier name, tried several ("VBox0", "Screen0", etc...)
4) Tried to generate single Xorg conf file ("sudo Xorg -configure"), but it terminates with error: "Missing output drivers. Configuration Failed".
And also i've googled anything related to fixed size screen WITH guest additions (which I still need for shared folders), seems nobody actually asked for it.
Any help will be appriciated, thanks.,

What is native resolution? 1080?
Do you need a window with guest os smaller than host video?
Did you try to set resolution on X guest and enabling autoscaled feature in VirtualBox?

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