Help with custom script for Buried Chalk in Scripting

Okay so i wrote up a very basic script for the buried chalk, where the player can choose where they want the weapon to go, everything works, but how do i make it to where the players can pick the spot? right now i got it set up to where the players has to be at a specific spot to place the gun, then the trigger gets enabled. But not sure how to make it so the player can pick the spot. here is my script

Code Snippet

Plaintext

#include maps\_utility; 
#include common_scripts\utility; 
#include maps\_zombiemode_utility;

init()
{
  thread kar98k_chalk();
}
//Kar98k Chalk
kar98k_chalk()
{
    da_guy = undefined;
    kar98k = getent( "kar98k", "target" );
	kar98k setCursorHint( "HINT_NOICON" );
	kar98k disable_trigger();
	kar98k_build = getent( "kar98k_build", "targetname" );
	kar98k_build setCursorHint( "HINT_NOICON" );
	kar98k_build sethintstring ("Press and Hold &&1 to Build Kar98k Chalk");
	kar98k_build disable_trigger();
    trigger = getent( "kar98k_test", "targetname" );
	trigger setCursorHint("HINT_NOICON");
	trigger sethintstring("Press &&1 to Pick up Kar98k Chalk");
	trigger waittill ("trigger");
	trigger delete();
 
 
    kar98k_build enable_trigger();
    kar98k_build waittill("trigger");
	if( !isDefined(da_guy.is_adding_part) )
		{
			da_guy.is_adding_part = true;
			kar98k_build delete();
			da_guy thread crack_knuckles();

			da_guy waittill("part_added");
			wait 1.5;
			kar98k enable_trigger();
			da_guy.is_adding_part = undefined;
	}
	}
 
	crack_knuckles()
{
	self DisableOffhandWeapons();
	self DisableWeaponCycling();

	self AllowLean( false );
	self AllowAds( false );
	self AllowSprint( false );
	self AllowProne( false );		
	self AllowMelee( false );
 
	if ( self GetStance() == "prone" )
	{
		self SetStance( "crouch" );
	}

	gun = self GetCurrentWeapon();
	weapon = "zombie_knuckle_crack";	
	self GiveWeapon( weapon );
	self SwitchToWeapon( weapon );
	self waittill_any( "fake_death", "death", "player_downed", "weapon_change_complete" );
	self EnableOffhandWeapons();
	self EnableWeaponCycling();
	self GiveWeapon( gun );
	self SwitchToWeapon( gun );
	self AllowLean( true );
	self AllowAds( true );
	self AllowSprint( true );
	self AllowProne( true );		
	self AllowMelee( true );
	self notify("part_added");
	return gun;
}

Note this is my first time at writing a custom script so i know some stuff may look weird.

var = undefined; //the variable has to be set before the actual script i chose to make it undefined switch(var){ // var is the variable case "1": // what the first option the variable could be break; // how to end a case case "2": // what the second option the variable could be break; }

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Help with custom script for Buried Chalk