You're not going to get anything from the honey malt. I'd just write that off.
Here's what I'd do:
Fermentables:
11 lbs. Extra light DME
2 lbs. Munich DME
1 lb. Crystal 20 (milled)
1. Steep a pound of milled crystal 20 for 20 or 30 minutes at 160F in 1 gallon of water (treated however you plan to treat water, e.g., with a campden tablet).
2. Once you remove the grains, add as much water as you can bring to a boil. Add some, but not all, of the extra light DME and none of the munich. I'd add about 1.2 lbs. of DME per gallon of water that you use. You don't want the boil gravity to be crazy high, and malt extract can darken significantly.
3. Stick to the hop schedule that you listed.
4. Add the rest of the DME (extra light and munich) at the last 10 minutes of the boil. Whirfloc isn't really necessary since this is extract but use it if you've already got it and you feel like it.
That might come in a little low OG-wise, depending on how much extraction you get from steeping the crystal malt. You could add another few more ounces of extra light at then end. I probably wouldn't, though.
Edit: I assumed you wanted a 5.5 gallon batch. If you want a 5 gallon batch, use a pound less of extra light. I agree with the claim that the hop schedule is too bittering-heavy. I also didn't pay attention to the sugar at the end. Not sure what you should do about that. Probably wouldn't hurt in a big IPA like this.
There's also this:
http://www.northernbrewer.com/documentation/beerkits/HopsLambImperialIPA.pdf. Northern Brewer publishes their recipes online, and this is their extract clone of Hopslam. Other online stores may do the same.