Pretty HABTM List Entry

I have a Recipe, Item, and Units table/model. I have a HABTM
relationship with Recipe and Item, and I get the default multiple-
select box when adding/editing Recipe. (am using Bake for everything
for the most part). The problem is I need to associate quantities and
units with each Item.

Sample of UI I'm hoping for: http://i.stack.imgur.com/Y4T6T.png

A big component of it is the ability to add/delete/edit the individual
items. I imagine looking at the submitted form data, and using some
jquery and clone would work. But I was wondering if someone already
created a Behavior perhaps for this already?

Current Models (shortened to the relevant stuff, ie removed users/
notes/etc):

class Item extends AppModel {
var $name = 'Item';

// id : int
// name : varchar
// unit_id : int

var $belongsTo = array(
'Unit' => array(
'className' => 'Unit',
'foreignKey' => 'unit_id'
),
);

var $hasAndBelongsToMany = array(
'Recipe' => array(
'className' => 'Recipe',
'joinTable' => 'recipes_items',
'foreignKey' => 'item_id',
'associationForeignKey' => 'recipe_id',
)
);
}
.

class Recipe extends AppModel {
var $name = 'recipe';
var $displayField = "name";

// id : int
// name : varchar

var $hasAndBelongsToMany = array(
'Item' => array(
'className' => 'Item',
'joinTable' => 'recipes_items',
'foreignKey' => 'recipe_id',
'associationForeignKey' => 'item_id',
)
);
}
.

class RecipesItem extends AppModel {
var $name = 'RecipesItem';

// id : int
// quantity : int
// unit_id : int
// recipe_id : int
// item_id : int

var $belongsTo = array(
'Unit' => array(
'className' => 'Unit',
'foreignKey' => 'unit_id'
),
'Recipe' => array(
'className' => 'Recipe',
'foreignKey' => 'recipe_id'
),
'Item' => array(
'className' => 'Item',
'foreignKey' => 'item_id'
)
);
}

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