I built a rudimentary tube visage from ripstop nylon. My approach is largely improvised. I learned a few things along the way.

Pre-reqs
Some rough idea of what you want to make, a bit of gumption, and the following things won’t hurt.

Supplies
* blower fan – buy a proper blower fan for a tubeman or improvise one of your own. I used one of these HVAC duct fans for my proof of concept
* blow fan platform: i went with a simple moving dolly.
* Rip Stop Nylon:  I bought mine from EmmaKites through Amazon
* Scissors
* large cutting mat (I bought this kit with mat/cutter/ruler – you’ll likely need an even larger mat)
* rotary fabric cutter
* long straight edge ruler type thing
* hand sewing needles
* sewing machine
* sewing pins
* Polyester sewing thread 
* velcro ™ type sticky tape for fastening tube-ojbect to blower base
* lots of space!!!

Planning
* Sketch out a rough design on a white board. Think about height, arm length, colors and proportion of each. It would be wise to match the torsoe and arm colors were they intersect.
* Purchase rip stop of desired colors
* Setup your sewing machine on a long table or workbench. You’ll need the space.
* Calculate the circumference of your pump mouth so you know how wide to cut your rip stop.
* Cut your rip stop to the length of the circumference. Pad the value by an inch or two.
* read this article for an explanation of how to create a strong stitch for assembling the panels together, top to bottom. logon for viewing full-sized images: johndoe123 : 123456789
screenshot:

Sewing
* sew your measured, cut panels together top to bottom one at a time using the method above
sewing according to your schematic. I would recommend using a simple reinforced single stitch.
* Experiment with the fabric and adjust stitch tension appropriately.
* you’ll end up with something like this.

* Identify the area where the arms will intersect and cut holes. The arms will likely be the most challenging area of construction. Consult with you local seamsperson first. I added mine after the tube was constructed which made assembly difficult.
* construct your tube arms according to the diameter of the holes you cut. Calculate the circumference of the arms from the diameter, as above.
* with the outside of the cut length of fabric facing INSIDE of your tube, pin the edges of the length of the tube together.
* sew up the entire length of the the tube
* sew along the top of the tube several inches below the very end of the tube. You can cut this for hair.
* Flip the entire closed tube inside out and pull head through nethers
* attach velcro ™ tape to bottom of tube and sew velcro to bottom of tube
* attach velcro to base of your HVAC fan and attach tube to blower
* attach fan to platform of some sort so it stands up

* give your tubesperson personality with custom face, hands, whatevs
* note: you may need to improvise holes in the head of the tube if your fan is pushing too hard against the fabric.
* here’s mine inside the house before the arms were assembled.