This has now become a MYOG pack construction thread.
I originally started this thread back in late November when I was trying to find some dark grey VX21 fabric. Our son requested this fabric and color specifically.
Here are some pictures showing my progress thus far.
Our son requested water bottle pockets large enough for 1 quart Gatorade bottles. Another request was a padded internal pocket large enough for 2 I Phones. He and his fiance' day hike together on the local trails.

I suggested the 4mm foam lined and VX21 fabric faced shoulder straps. There is no internal padding in the straps. I included shockcord water bottle carriers on the straps and a sternum strap.

There is a large pleated mesh pocket on the front of the pack to stuff raingear in if necessary and it has some shockcorded "support" to keep the pocket contents under control. This pocket and the water bottle pockets are made of soft finish Leno Mesh with black silnylon "casings" for the elastic on the upper edges

There is a small plastic clip in the center of the laced shockcord that allows a quick release of the tension when gear is inserted or removed from the pocket. The grosgrain near the top of the pack is a dress up item. It covers the stitching where the internal I Phone pocket was sewn to the inside/front of the pack.
I didn't snap a picture of the I Phone pocket as yet but it is zippered 4mm foam mesh and is bound around the edges with folded 1" grosgrain.
Our son specified a zippered closure for the main pack bag. I used 5mm water proof zipper tape and reversible dual tab sliders from Quest Outfitters. What you will notice is that I haven't constructed the pack lid as of yet. Pictures of the finished product will be forthcoming.
Thanks to all who offered assistance in helping me secure the necessary fabric. This dark grey VX21 fabric was obtained from a good friend who was willing to part with half of what this friend had on hand in this color and style.
The BPL community continues to amaze and impress me. ;-)
Party On,
Newton