Never had it, so am just going by the style. I always aim high for barrel aging, which can thin out a beer's mouthfeel. So, for an Imperial Red IPA, maybe target 1.100 - 1.110?
Liberal use of higher caramel malts, like C65 - C90 to get the red and the caramel notes.
A whole boatload of bittering and flavoring hops, but no whirlpool or dry hopping, that would just get lost with the barrel aging.