I have a DIY G4 that I made thinking I would like a frameless pack. But it's too lightweight for me considering that for right now I still have to carry some of the kid's gear when we go out. So I ended up getting a framed pack that can carry a heavier load.
If you want to buy it, PM me. I get some pics of it later today after work to send you.
This was NOT my first DIY project, so you don't have to worry about the details or quality -- hence the trailname.