The first thing I did was to switch the Martian Manhunter's legs for Batman's using the boil-n-pop method.  The two sets of legs weren't completely compatible, so putting the Batman legs back on the MM torso wasn't exactly easy.  I finally got them on, but they're so tight that they won't bend at all (which is okay, I suppose, since his wings won't let him sit down anyway).

I debated a bit about whether or not to use the Hawkman head.  I don't particularly like to use parts from the figures I'm trying to make, but convenience won out in the end.  Well, it wasn't that convenient, since the MM's head included a neck, while the Hawkman head didn't.  So I carefully cut off the Martian Manhunter's head just where the head meets the neck.  Next I glued a thumbtack onto the Hawkman head and pushed it down into the MM neck. 

Next I used Kneaditite to fill in the holes left from where the MM's cape attached to his shoulders; I also used it to complete the straps which cross over his chest.  Another thumbtack was pushed into his chest where the straps meet to form his Hawk emblem.  Then he was ready for painting.  I chose to go with a color scheme which matched Mattel's Hawkgirl.

Hawkman is taller than several of my animated figures, especially the newer Justice League figures, but he fits in pretty well with the older-style Superman, Batman and other customs made from those bases.