You may want to try Barnaby Wainfans' website- He's the guy who came up with the Facetmobile. Also I have built several delta's of every desription. I have built some that even had a negative aspect ratio. Some were VERY THICK- up to 30 percent thickness to chord ratio.
Ieven built one that was a flat plate with all the radio stuff hot glued on top, and believe it or not, it had one of the better glide ratios of them all!
Feel free to e-mail me and we can discuss this delta stuff at length.