I created these design templates earlier today to save time and help me design a custom Mando for myself.
I used a basic Human male from a 3D model I have, then captured the image and placed a Mando helmet there. I've only done a front and back view, but I thought it'd come in handy for any other budding Mandos out there. Simply use these as a base to sketch your armor designs onto it, test colour schemes, whatever really.
I hope they come in handy, enjoy!