A few helpful extensions to get the render bounds (world space) of a game object, including all its children. Handy for placement at the edges of groups of meshes/text, or finding dead center.

BoundsHelperExtensions

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public static class BoundsHelperExtensions
{
    public static Bounds WorldBounds<T>(this List<T> listOfThings) where T : MonoBehaviour
    {
        Bounds bounds = new Bounds(listOfThings[0].transform.position, Vector3.zero);
        foreach (T thing in listOfThings)
        {
            bounds.Encapsulate(thing.transform.position);
        }
        return bounds;
    }

    public static Bounds RenderBounds<T>(this List<T> listOfThings) where T : Renderer
    {
        Bounds bounds = listOfThings[0].bounds;
        foreach (T thing in listOfThings)
        {
            bounds.Encapsulate(thing.bounds);
        }
        return bounds;
    }

    public static Bounds RenderBounds(this Transform transform)
    {
        List<Renderer> rends =  new List<Renderer>(transform.GetComponentsInChildren<Renderer>());

        if (rends.Count > 0)
        {
            return rends.RenderBounds();
        }
        else
        {
            return new Bounds(transform.position, Vector3.zero);
        }
    }
}