Recent modpack version by Odem Mortis (OMC). Lots of content inside including tweaks, fixes, tools, zooms, crosshairs and so on. You can the mods during the installation.
The list includes hitzone skins though I would strictly recommend against using them. Otherwise, some unfortunate issues may occur as were shown by Cheating in World of Tanks video.
The developers recommend performing the clean installation to prevent problems with compatibility.
(German voiceover, English interface)