Create a CubeGrid in Three.js - three.js

Question

In Three.js there is a GridHelper that allows you to create a plane grid easily, just like this:
var grid = new THREE.GridHelper(size, divisions, colorCenterLine, colorGrid);
You can see a result example here.
What I want to do is to create a box/cube grid, exactly like this:
I need to have a cube, because later I'll want to know, for example, if an object it's inside the cube (dynamically).
I wasn't able to find a helper that do what I need, so my idea is to take the GridHelper source code and use a BoxBufferGeometry instead of a BufferGeometry, but I don't even know if that's possible. I want to add that I do not have much knowledge in the field of 3D graphics, I'm just starting.
I'd love to hear you thoughts about this: I'm going in the right direction? How would you approach this problem?

Answer 1

I've finally used the approach that #WestLangley proposed:
var createBoxGrid = function (base, height, translateY, divisions, color) {
boxGrid = new THREE.Group();
boxGrid.name = "BoxGrid";
var box3 = new THREE.Box3(new THREE.Vector3(-base / 2, 0, -base / 2), new THREE.Vector3(base / 2, height, base / 2));
var box3Helper = new THREE.Box3Helper(box3, color);
var gridHelper = new THREE.GridHelper(base, divisions, color, color);
boxGrid.add(box3Helper);
boxGrid.add(gridHelper);
boxGrid.translateY(translateY);
return boxGrid;
};