Carlos Gove indeed did make underlever Rolling Blocks, and also did wiping rods with thimbles as this rifle has. So my guess is that Haugh built this rifle as a clone of the Gove style Rolling Block.
It is indeed a #1, but it is not a #1 Sporting Rifle action. It is a military action, and quite likely a later smokeless military action as it has the heavier round top receiver used on later actions, and the rotary extractor that the Sporting models didn't have. All early actions used a sliding extractor, so this can't be an early action.
The previous owner has every right to have been extremely proud of the craftsmanship of this build! It's as good as any Rolling block build I've ever seen!
I've got a couple dozen Rolling Blocks in my collection, and they're a close second to my Ballards as a favorite!