Am I right in assuming that the net goes over the top of the cargo and attaches to the floor inb'd/Outb'd and fore and aft? Is the cargo placed in standard containers before being covered by the the net?
If the net is attached to the floor at 4 points, the reactions are going to be related the nets deflected shape and the angle of the individual straps, which will differ depending on their location, either fwde or aft. You will need to come up with a worst case for the net and the straps and substantiate it on that basis.
Nigel Waterhouse B Eng (Hon's)
Can-Am Aerospace,LLC, Canadian Aircraft Certification Centre