Building a cargo net at home is entirely possible for even the most inexperienced of craftspeople; it requires no special skills. All a homemade cargo net really requires is time. There are a lot of individual manipulations and fastenings that must be made. The amount of time taken by this project will depend upon how big of a net you want to make and how strong you want the end points to be.
Measure the size of the cargo net you want. For example, for a truck bed cargo net you would measure the bed and add 10 percent for some give in the design. Find a dry open area that is clear of foot traffic to lay out your tools.
Cut lengths of nylon rope the length of your measurement (with the added 10 percent for give as nylon rope does not stretch). Lay down one length away from you and then another line perpendicular to the previous line. Wrap one line around the other so that they switch direction, the one going away now going perpendicular to its previous direction.
Repeat the layering of lengths of nylon rope with the perpendicular wrapping where they overlap. When you have a net the area of your measurement, stop adding rope. Attach zip ties at each overlap to secure the ropes, pull it as tight as you can because the nylon is very smooth and can slip through.
Wrap the end of each rope back on itself to form a loop no more than a few inches across. Place a wooden board under the loop and tape it down. Use a blow torch to affix the end of the rope back onto itself while wearing a respirator mask and goggles. Do this until the nylon end has fused back into itself, forming a complete loop.