Sure thing! I'm always more than happy to share some tips. ^^
^^ I actually used a two part method. I used a children's Iron Man mask as a base for the front face plate. I placed said face plate over a wig head measured and adjusted to the same size and my own head. I then wrapped reversed tape (being that the sticky side was facing away from the wig head) around the whole of the back of the head, attaching it to the previously placed mask. After that was done, I taped over the first layer of tape, this time placing the sticking side down over the first layer. Once that was completed, I had a good wrap around base to begin with. The next step was to layer the entire thing in one full layer of paper mache. Once the first coat was on, I placed in the brows using electrical tape and paper towels. This was also used to round out the chin. I also used tape to take some of the contour out of the cheek bones and to fill in lines and holes in the face plate that I didn't want in the finished product. This was optional...I just preferred the way it looked. Once this was done, I finished layering the entire thing in a few more layers of paper mache. The next step was to use Bondo, layering it over the whole of the form (letting it dry between layers, of course). Once it had enough coats, I sanded it down and hot glues on a foam ridge so the back wouldn't rub my neck raw. A few layers of red spray paint gave it its color and a few layers of white tool glued into the the eye holes made for its lenses. After that all that was left was to hand paint the black around the eyes. ^^
It was a little bit complicated, but I made it in literally a couple of days. So, it can be done fairly simply. :3 I did the bulk of the work in one night before a con I had to wear it to the next day.