ok ok here are pics of my templates the bolter is for size comparison


you take the trapazoid and wrap it arond your paintbrush to get the curve and use a combo of plastic and crazy glue to attach the big end of trap and put it on the termie.(Warning this is an extreme pain in the ass and my take a few to get it right.
now with the rectangle use your clippers to cut out the knotch as shown on this pic

http://www.pa-sy.com/hhccg/images/justaerin.jpg



and glue this piece on top of the trapazoid like you see on my marines above.
once dry trim off excess and you should be done.

dang! With some detailing work that could end up pretty damn nice :o
kudos on that!

Excellent job! That terminator really looks the business! :)