This is a Lego design sheet I made a year or so ago, some of the dimensions might be off though because I never fully tested it, but they can be fixed easily and quickly so uhh I'll just post it already:

In the words of Gabe Newell, "Thanks, and have fun!"
And I might update it later to include more parts (custom hat designs anyone?) so Just hang tight while I try to make my Blockland avatar IRL and find time to add more parts.