http://skyrim.nexusmods.com/mods/26016/?. It's excellent--I'm using it now. She also has also http://skyrim.nexusmods.com/mods/37916/? that I'm using that changes the Storage Room in Lakeview Manor to a greenhouse. So my skilled Alchemist has her greenhouse, kitchen, kid's bedroom, and library, all in one house! They're both very organized, with lots of labeled and unlabeled storage, and without all the furniture clutter in the original HF options. And no annoying buzzing bees/insects flying around the house!
You can't undo stuff, but you could just build another one of the houses; there are three.
With previous characters, if they were alchemists, I used Windstad Manor in Hjaalmarch, because it had the fish hatchery, which really synergizes well with the greenhouse. I'd build the alchemy tower (and not build the table in the main hall) and greenhouse, but skip the enchanter's tower in favor of a kitchen, because you're not really gaining anything you couldn't have with the table provided in the main hall. So if you've built Lakeview, you could simply also build Windstad and use a different set-up.
And keeping a dedicated save from before building the houses is recommended: lots of stuff can glitch and go wrong, or you could just want to change something. I've gotten into the habit of collecting all the materials I need to build and furnish the house in one go and just doing everything at once so I can redo stuff if I want to without worrying about having to replay hours of exploring.