That was the spark I needed. Thanks! Still have some tweaking to do to get the colorization right though. Not showing the yellows or oranges...
var number CFD = ToDays(ToDate([Calculated Finish Date]) - Today());
var number Dur = [Duration];
var number PC = [% Complete] *10;
var text Red = "#FF3030";
var text Yellow = "yellow";
var text Orange = "#fda302";
If(
$CFD < 3 and $Dur < 10 and $PC < 50, $Red,
$CFD < 3 and $Dur < 10 and $PC < 70, $Orange,
$CFD < 3 and $Dur < 10 and $PC < 85, $Yellow,
$CFD < 10 and $Dur < 30 and $PC < 50, $Red,
$CFD < 10 and $Dur < 30 and $PC < 70, $Orange,
$CFD < 10 and $Dur < 30 and $PC < 85, $Yellow,
$CFD < 30 and $Dur < 90 and $PC < 50, $Red,
$CFD < 30 and $Dur < 90 and $PC < 70, $Orange,
$CFD < 30 and $Dur < 90 and $PC < 85, $Yellow,
$CFD < 35 and $Dur >90 and $PC < 50, $Red,
$CFD < 35 and $Dur > 90 and $PC < 70, $Orange,
$CFD < 35 and $Dur > 90 and $PC < 85, $Yellow)
