This is the Blood Dragon Helmet from Mass Effect 2.
This helmet is size for an adult make but check the dimensions in the pdf file. The units are in millimeters.
Thank you Jace for providing the model you rock all day and all night !!!
I design props and costumes mostly. I am not an engineer nor a trained artist. I learned almost everything from watching Youtube videos and just messing around in designing software. I started designing with Fusion 360 in August 2016.