• First, grab a copy of LEGO Digital Designer for free from LEGO.
• Then go to Powerpig's blog and download one of the two iPod model files.
• Within the LDD application, you can order a model to "Design By Me" on LEGO.com by selecting "View > Send to LEGO.com". Each model is about $30.
• If you want to save a few bucks, Powerpig offers this advice: "If you go to LEGO Pick-A-Brick and pick out the pieces yourself, you'll save yourself a $10 handling fee for LDD.