I also agree to extend the boil out a couple hours and lose 2 crystal malts, maybe just 12oz of 40l. You will gain color and carmelizing, both of which go well with barleywine. I also like magnum hops for barleywine, it is a strong bitter hit and lets the malt shine through. I do like 148* mash, but do it for a couple hours to make sure to get full conversion. Love barleywines, hate the wait! Let us known how it turns out, you think 6 months, a year?