First things first: You've got, by your own admission, three brews under your belt. I'm going to Ruin Your Fun by advising you to not go out on a limb.
You want to christen your new kegorator - props to SWMBO, by the way!
- with a special beer. That's fine. Recognize, however, that big beers like your proposed recipe, which is assuredly a big beer, take a goodish bit of finesse. I strongly advise you to wait until you understand brewing - from recipe formulation to fermentation - better before you go too far afield. Brew a more approachable recipe.
You can't brew outside the box if you don't know what the box looks like, what its dimensions are, what it's made of. After only three brews, you can't possibly know that. So increase your chances of confident success by staying inside the box a little longer, K?
Now, let's take a look at your proposed recipe.
Take another look at the Irish Red Ale style parameters. Max OG is 1.060. Above that and you're doing something else; it may be tasty, but it ain't Irish Red Ale.
I like your grist, to a point. You've got the key ingredients, which is awesome. Unfortunately, amounts are out of whack. The addition of Munich extract is very good indeed. The Crystal malt amount is very much excessive. Don't exceed 10% in a beer like this, or it will be cloyingly sweet regardless of how high your calculated IBU.
I'd reduce the Pale extract to 6 lbs, replace the Crystal 20L with a half-pound of Crystal 60L, keep the Munich extract the same, and knock the Chocolate back to 2 ounces. That should get you ~1.060 OG.
Now, before we go to the hops, let's talk yeast. The style requires a fairly dry finish. That means, to my mind, attenuation of at least 75% - if you start at 1.060, you should end below 1.015. Windsor will not
do that. Windsor is a yeast you choose for a low-gravity session beer like Ordinary Bitter or Scottish 60/- or Mild, to get flavor and body from residual malt sugar. S-04 might
get there. It's a far better choice than Windsor in this application, I can tell you.
On to hops. One ounce of Northern Brewer pellets at 9% alpha acids will, according to my calculations, produce 42+ IBU in a wort derived from my suggested grist. That's waaaaaaaaay too high. Irish Red Ale is not supposed to have a pronounced bitterness. You'll need to know the AA% of your specific hops, but I'd not exceed 25 IBU. Especially if you're adding flavor hops, which I think is a good idea. I'd knock it back to a half-ounce - you want subtle - and call it a day.
That's about it as far as my feedback. Summing up: Until you've got some more XP, don't go too low in the dungeon. Keep killing kobolds and skeletons, gain a couple of levels, and then
go after the trolls.