Finally I finished the insert for Osprey Daylight.
Here are the pictures with a bit explanation. In case someone wants to repeat that pain
I decided to stitch by hands partly because I was lazy to take out my sewing machine I've not used for a couple of years, and partly because I could use the machine for only covering the foam.
Molding the shape with polyethylene packing foam was the most time consuming part to make the insert fitting perfectly, and leave the room for the fabric as well.
Then it was time to do the "upholstery" of every single piece of foam. I bought the yard of Veltex loop fabric, it's velcro, so I can put dividers wherever I need. I don't not need to make divides, have plenty of them from the collection of bags for now.
The backpack inner pocket fits my Dell XPS 13" laptop. Not like I'm going to take it outside all the time, but it's good to know that I can. The laptop size is 8x12 inches. There is also a water pocket on the back, good for the wallet to carry close to the back. It's also small front pocket, for batteries, cellphone, memory card.
The final look, holds K-1 with DA*300, still place either for 2 or even 3 primes, or flash. It may fit two cameras with primes, and probably the flash (need to try it ). Sirui small travel tripod fits perfectly in the side pocket, secured with the strap.
So far I like this as a replacement for camera slings and bags. It's light, small, breezy, and not black!