Bubble grid chart with custom labels using guides

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/xy.js"></script>
<div id="chartdiv"></div>

CSS

body {
    font-family: Verdana;
    font-size: 12px;
}
#chartdiv {
	width	: 100%;
	height	: 500px;
}

JavaScript

var chart = AmCharts.makeChart("chartdiv", {
    "type": "xy",
    "dataProvider": [{
        "y": 1,
        "x": 1,
        "value": 59,
        "y2": 2,
        "x2": 1,
        "value2": 44,
        "y3": 3,
        "x3": 1,
        "value3": 22
    }, {
        "y": 1,
        "x": 2,
        "value": 33,
        "y2": 2,
        "x2": 2,
        "value2": 28,
        "y3": 3,
        "x3": 2,
        "value3": 15
    }, {
        "y": 1,
        "x": 3,
        "value": 21,
        "y2": 2,
        "x2": 3,
        "value2": 40,
        "y3": 3,
        "x3": 3,
        "value3": 20
    }, {
        "y": 1,
        "x": 4,
        "value": 50,
        "y2": 2,
        "x2": 4,
        "value2": 48,
        "y3": 3,
        "x3": 4,
        "value3": 36
    }],
    "valueAxes": [{
        "position":"bottom",
        "axisAlpha": 1,
        "gridAlpha": 0,
        "labelsEnabled": false,
        "guides": [{
            "value": 1,
            "label": "2014 Q1",
            "lineAlpha": 0
        }, {
            "value": 2,
            "label": "2014 Q2",
            "lineAlpha": 0
        }, {
            "value": 3,
            "label": "2014 Q3",
            "lineAlpha": 0
        }, {
            "value": 4,
            "label": "2014 Q4",
            "lineAlpha": 0
        }]
    }, {
        "minMaxMultiplier": 1.1,
        "axisAlpha": 0,
        "gridAlpha": 0,
        "position": "left",
        "labelsEnabled": false,
        "guides": [{
            "value": 1,
            "label": "Banking",
            "color": "#ff3366",
            "lineAlpha": 0
        }, {
            "value": 2,
            "label": "Construction",
            "color": "#ff3366",
            "lineAlpha": 0
        }, {
            "value": 3,
            "label": "Education",
            "color": "#ff3366",
            "lineAlpha": 0
        }]
    }],
    "graphs": [{
        "balloonText": "x:<b>[[x]]</b> y:<b>[[y]]</b><br>value:<b>[[value]]</b>",
        "bullet":...