First time poster here, so take this with a grain of salt, but...it seems very few people think to consult Allagash's own website for the info.
From their own page:
"Grains: Allagash 2-Row Malted Barley Blend, Red Wheat Malt, Raw White Wheat, Oats, Carapils
Hops: Nugget, Crystal, Czech Saaz"
Taking into account the first post in this thread (yeah, it's from six years ago and I am very late to the party) which suggests using 15% wheat malt and 25% raw wheat, plus the info straight from Allagash, my amateur-ish guess at the proportions are:
50% two-row (and not pils malt as seemingly EVERYONE believes)
25% raw wheat (I've heard of some people grinding and mashing raw wheat berries, but I'm pretty new to brewing so I'll stick with flaked for the time being)
15% wheat malt
5% flaked oats
5% Carapils
For 5 gallons, this puts you at something like:
5# 2-row
2.5# raw/flaked wheat
1.5# wheat malt
.5# flaked oats
.5# CaraPils
...which BrewersFriend estimates will put you at OG 1.054, FG 1.015, 5.08% ABV (at 75% efficiency). Allagash clocks in at 5.1% so that's pretty damn close. Rice hulls would certainly be helpful to keep the mash from getting too sticky.
As far as hopping goes, it seems you definitely don't want to break 15 IBUs. I'm really new to developing hop schedules, but when I do my brew, I'm probably going to aim for:
.2 oz Nugget (whole, ~14%AA) @ 60
.2 oz Crystal (whole, ~4% AA) @ 30
.2 oz Czech Saaz (whole, ~3.5% AA) @ 15
...which BrewersFriend suggests will put me right about 14 IBUs. If you're rocking pellets you can drop the Crystal and Saaz down to .15 each or just drop the Nugget down to .15. Please feel free to correct me on this, this is rough calculation at best.
Sorry for the long post, but it seems like there's a lot of available data across the interwebs that, for one reason or another, has not all been drawn together. I hope this is helpful to someone!