Borg's suggestion will get you to 8.5 % ABV. A pound of dextrose in 5 gallons adds 0.009 points and about 1.2 % ABV (since if ferments 100%)
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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if you can mash 6 lbs 2-row + 1.25 lbs crystal 20 and add 6 lbs. dme to that you should be around 1.090 (thats @ 75 percent u. for the mash)
then proceed with the crazy hop additions and sugar and all that jazz...
Borg, how are you able to convert that AG recipe to this partial mash? Is there a documented way on how to do this or is this an educated guess? This would help me a lot since I'm not always able to find a partial mash version of a recipe and I end up annoying people around here to no end trying to convert the recipe!