When building Leg-Armor ,gauntlet armor ect , hand made and to your measurements it can be a bit hard , Here I will explain how to make a custom dummy arm for props using easy to find materials , the same Technic can be applied to almost every body part ! The only thing you really need to buy for this is Silicon base Bondo or filler and you can get this in any hardware store for less then 10 Dollars
I used the dummy leg to make this" https://www.instructables.com/id/How-to-Build-Leg-... ", so if you are interested in making leg armor click that link !
Step 1: Step 1: What You Need
Wire Cutters / Wire Bender , Wire that you can easily get form a hanger or you can buy of low thickness tape and silicone based filler and wheat flour or glue depending on how you like to make paper mache .
Step 2: Make a Sketch
This is the blueprint for the internal structure and getting this right will help you a lot mark down the max dimensions of your arm or leg and the min at certain like elbow shoulder wrist like in the picture .
Step 3: Cut Your Wire
Cut your wire and straiten them out in long pieces ,rearrange so they make a hand shape use your hand to get the dimensions right .
Step 4: Putting It Together
Tape the bottom of the wires , and gently use a thinner wire to tie the parts you made .
Step 5: Tie in More Wires
Tie in more wires until it is ringed and strong.
Step 6: Get a Slab of Wood and Styrofoam
This will be the base , I got this for free that's why its a triangle ( I am on a budget ) ,the styrofoam I found on the street :D , you can use expandable foam for this too but that will elevate the cost.
Step 7: Putting Together the Parts
I used silicone but I would recommend a stronger glue just in case .
Step 8: Putting Together the Parts
Here you will use the measurements you took early on , from the base to the middle finger it should have the desired height trim around the base and make it thinner then your arms width.
Step 9: Cover the Base
In this step you will cover the base with aluminium paper to make it stronger and to put paper mache on it later .
Step 10: Now Make a Double or Triple Layer Copy of Your Arm Using Aluminium Paper
Now make a double or triple layer copy of your arm using aluminium paper Use this copy and gently put it over your base ,tape it around gently put it together
Step 11: You Can Use Wheat Flower or Glue
Make a paper mache mix , Mix one part flour with one part of water or Mix half part white glue with one part of water
Step 12: Cover It
Cover it completely in paper mache Around the arm use a cross method to give it strength let it dry for a few hours in the sun .
Step 13: Cover It Again
Now cover it using the silicone based Filler apply 2 layers .
Step 14: Mark It
After it drys a bit mark the elbow and palm and the areas you work around the most ,this will do wonders for you .
Step 15: USE IT !
After it drys you are all set
Thank you for checking this out !