You are free to modify code. This plugin is currently in use on my server; you can join and see how it performs.

• !awp / sm_awp - call an awp vote (restrict / unrestrict)
• !changemap / sm_changemap - call a changemap vote (last map and the current map are removed from the cycle)
• !resetcooldowns / sm_resetcooldowns - reset all cooldowns (generic_admin flag required)

• You can change basic options at the beginning of the code.
• Cooldowns are in minutes.
• Sourcemod colors are used: View colors

#define AWP_COOLDOWN 3
#define CHANGEMAP_COOLDOWN 6
#define DEFAULT_MAP "de_mirage" 
#define PREFIX "\x0BALYXHVH \x08▪"

• You should install Custom Votes by KoNLiG. I've already added it to plugins/customvotes.smx. You can find the include file at scripting/include/customvotes.inc.
• Additional components (while my logic relies on them, you have the flexibility to adjust their necessity): Weapon Restrict by Dr!fter and the default SourceMod "votemap".