ARMS
Arms are very different sizes obviously, so this is an instance where you are going to have to play with the templates to find YOUR size.
I tried to make the templates easy to understand and adjust.
Upper arm:
Print out the triceps and bicep templates. You're going to need to print out 5-6 plates for the triceps and 5-6 for bicep. You'll know how many you'll use depending on your arm length. I went with 6 for the triceps and 5 for the bicep.
The first thing I did was cut out the 5 tricep and 5 bicep paper templates. then I assembled them. I held them to my arm and taped them together so I could see exactly what size I needed to cut the plastic.
I marked the templates accordingly and cut out the plastic. The bicep part wraps around your bicep and the tricep part around your tricep.
When you have a nice paper upper arm built and you're happy, take it apart and cut your plastic. I would cut one bicep and one tricep strip at a time assemble them, then the next. That way you can better gauge how much the thickness of the plastic comes into play when cutting the length of the next strip. Since they over lap, each one has to be a little bit longer to accommodate for the increase in size.
I cut mine out and test fitted them but didn't rivet them. before assembling I heated them up with a heat gun and gave them a little bend just to help me assemble everything.
Now just rivet each section together.
Test everything as you go to make sure it is all fitting together.
Once they are all assembled you can rivet each section to it's neighbor to form one upper arm section.
As you can see I made my bicep strips a little shorter toward the elbow to create a taper.
Forearm
For the forearm I basically repeated the above steps.
Cut out your three (might need four) forearm sections in template form and test fit everything in paper. The forearm sections are just one strip, not two combined like the upper arm. When you're happy with your fit, cut the plastic parts out using your modified templates.
Cut the the strips out and assemble each part.
Trim and do another one.
Test fit as you go.
To connect the sections together I cut a long strip of scrap plastic about 1 inch wide and riveted the sections to it.
Lastly, I cut two elbow sections out and riveted one to the upper arm and one to the lower arm. I cut out a circle and placed it over the elbow and rioted the elbow sections together in the center of the circle. the elbow pivots on this rivet.
The little squiggly line above the elbow is silver sharpie I was using to mark the plastic.
My circles suck because I free handed them. Use the template to cut nice circles.
Testing the size is most important here.
This might not be the best way to do this, so experiment and have fun.
I'll answer any questions but I won't be back online until this time tomorrow.
:cheers