I have made a floor for my cataraft. I got everything I needed from Seattle Fabrics online. I used their trampoline fabric which is similar to the product NRS uses. If you are doing a suspended cargo floor for a raft you can use the cheaper phifertex fabric. Stretch is not an issue woith the trampoline material.
My floor design used two layers of 1" webbing to reinforce all the seams and the perimeter. (1" hem in the mesh betwen two layers of webbing.) I added grommets at 8" o.c. around the perimeter and laced it to the frame with 1/2" tubular webbing. I found it very difficult to get enough tension on the lacing to do a nice job and prevent sagging. The longer frame bars would bend and it was reall hard to get even tension on all sides. Eventially I gave up and made a wood floor out of 1X6 mahogany slats spaced about 6" o.c. with 3" dia. holes drill in the boards for tie downs and to reduce weight.
I noticed that many commercial floors us cam straps, I went with the lace up design to save the cost of buying 20 plus buckles and avoid cutting my feet on metal. While the cam straps might help with the tension I would still need to install addtional cross braces to keep the longer bars from flexing. If I were to do it agian I might add a 1/4" dia. aluminum rod to the hem to stiffen the perimeter.
If you are doing a suspended floor for a raft instead of a tramp floor, I would look at the designs by Stiches and Stuff or River Tuff. These are big bags that combine a suspended floor, a drop bag and cargo net in one unit. I have friends with these and they make rigging a dream.
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