Ten feet long sections on the car  roof
         18 - 10  foot long sections of 1¼" schedule 80 PVC electrical conduit
         12 - 2.5 foot long sections of 1" heavy wall  steel electrical conduit

Tools List

T-10 parachutes were the workhorse of Airborne troops since the mid sixties.   They are roughly
24 feet in diameter and 32 feet in arch  {please measure yours and adjust the circle accordingly}.
The one you want was used for cargo or air calvary.

The elite forces chutes have flight control holes in about 1/3 of the perimeter  {You need two of these or to fix two 4' x 8' holes and eight 3'x3' holes.}   Elite forces started using HaLO parafoils in the mid eighties {these are 8' x  24'}.

There is about  2 feet of netting ringing the bottom of these chutes to prevent them from inverting.

Ask your seller if their are flight holes or open and look at the parachute.   These chutes can be found at all surplus stores, on ebay or see the links under Quartermaster.

How to Build It

Building the Batons
If you  are using 10' sections you will need 12 batons.   If you have some 20' sections you need 6 batons.
Cut  6 - 2.5 foot long sections of 1" heavy wall  steel electrical conduit using the conduit cutter.  The conduit cutter does cleaner and smoother cuts then the hacksaw plus it is quick and quiet.

Now wrap the Duct Tape code certified 333 tape about 10 times around the batons so they fit snugly into the 1¼" schedule 80 PVC electrical conduit.   Use four wraps about 3 inches from each end and on either side of the center.  If you use normal duct tape desert heat will melt it sealing the conduit into a 30' long section.
Batons made of PVC pipes or PVC conduit failed {pictures available on  request}.

Assembly
Put the batons into  the PVC conduit at the  joints.
Using the above drawing put the red taped joints on the red taped joints so the blue ones form a star.
Slide the joints on  the obtuse angle at the red tapes and tighten them down until the plates bend a bit.
Slide the joints on the obtuse angle  at the blue tapes and tighten them down until the plates bend a bit.
Facing  the bolts down away from the parachute increase the chute life.
Run the mason line from one red joint to the opposite so you parachute does not form a donut in the rain.
I've also seen small 10' sections of PVC pipe used to form the crown instead of mason line, just basket weave it.

Staking
Measure the circumference of you parachute at the netting.    Divide this number by 3.1416 to get the diameter of the brown circle  on the layout  plan.  This should be somewhere between 22 to 25 feet.
Drive a rebar into the center and use another rebar to sketch this onto the ground.   If you are building new and have nice straight pipes just drive the 3' rebar where each pipe hits this circle leaning toward the center.   Please leave about a foot of stake out of the ground to place the ribs on.

If you are working with old dome ribs.    The doors or parallel pipes are roughly 6'6" apart, this means 39'.   If you  subtract  39' from the parachute circumference then divide by 6 you will get the second measurement {roughly 6'}.   If you drive stakes evenly around this circle at roughly 6' then 6'6" you will have  the staking pattern.

Popping and Covering
Find 12 of your new friends  for a very quick job.   All  they have to do in put their end of the rib over the stake as they walk towards the center.

Stake it down with the 3' checked stakes.    I hook them through the handles found on the chute at the edge of each panel.

We just pull the handle from the stake on the down wind side and use clothes pins  to  form a door or vent doors. Putting the spare water or supply boxes on the chute nets inside the dome on the windward  side helps take the  belly out of the chute and keeps it from blowing away during dust storms in an un-occupied camp.

I would like to thank Spacelab for the 30 foot dome plans, the Playa for forcing me to redesign it into two smaller T-10 domes,  and my neighbors for letting me keep domes up for entire summers so I could watch them  fail over time.