Like others posted, if you just leave out the advlt bed, it actually works (assuming you don't need the western wing for something else).
Really, the advlt bed for that wing was just an odd addition anyhow...I don't really care how that was normal 300 years ago--so was marrying your cousin and being betrothed to an advlt when you you were 8-years-old! The point is that it's f**king creepy, and what's more, it screws with the game mechanics (i.e. your spouse will consistently choose to sleep wherever you aren't sleeping!)!
I'm playing again with the Legendary level caps etc (I'm amping up the difficulty from Expert Master and maybe Legendary to make up for being level...oh dear, 114? Good lord...) and wanted to try making a Heljarchen Hall with the wraparound balconies, and I'm quite happy how it turned out (I've got all of the regular houses, plus Lakeview Manor, with the Greenhouse, Alchemy Tower, and Armory wings added, too).