Some friends of mine want to do an authentic India Pale Ale, so I made up a recipe for them. I just wanted to know if any of you more experienced people had any comments on whether it'll be any good before I lose my reputation as a good person to go to for beer advice

From Wikipedia:
"Modern day versions are usually 5.5% to 6.3% by volume, though the original versions were considerably higher...
"...in modern times typically 35-48 on the IBU scale, though originally probably more than 60 IBU."
So, I made it my aim to go for a malty beer with 8% alcohol and an IBU of 60. Here's my recipe:
The Paint and Wallpaper Authentic India Pale Ale
Kit:
* Coopers India Pale Ale (IBU 23.5) or Coopers Pale Ale kit (IBU 19)
Additional Fermentables:
* 3kg Light Dry Malt Extract
Additional Hops:
* 20g Cascade at 60 minutes
* 20g Cascade at 30 minutes
* 20g Cascade at 10 minutes
* 20g Cascade at flameout
Replacement Yeast:
* 1 or 2 sachets of Safale S-04
Method:
* Borrow Rob's big pot.
* 2/3 fill put with water, add LDME. Bring to a light boil. Add first lot of Cascade hops, boil for 30 minutes. Add second lot of Cascade, boil for another 20 minutes. Add third lot of Cascade, boil for another 10 minutes. Add fourth lot of Cascade and remove from heat.
* Add the Pale Ale kit, dissolve. Cool wort to arount 50°C, add to fermenter, top up to 23L. Aerate the wort by stirring it briskly.
Pitch yeast.