I think I've said this recently in this thread, but using Bananza will help get you close. Of course using fresh good quality hops. Use, citra, cascade, simcoe and amarillo in whatever ratios, combinations and amounts you want. Base malt, carafoam and some caramalts. Its also worth to note that TH is getting good quality base grain. No Briess stuff etc..
I just kegged a batch fermented with 2 packs dry conan, 2g each of t-58 and b-256. Used briess pale ale malt, carafoam and a little caramunich. Kettle hopped with cascade, citra, simcoe and amarillo. Dry hopped at 50 - 55 for around 30 hours with citra/simcoe and a touch of amarillo then crashed to 40, dump hops and keg. Will report back in a couple weeks.
FWIW there's a local brewery by me in NJ that makes an all citra IPA that reminds me of julius. They have the ingredients listed on the can. Citra hops, two row, oats, caramalts and house ale yeast which I believe is London fog. Check out Eye of the storm citra by Jersey Cyclone Brewing.