Tim S wrote:

I agree that stock sliding doors don't always look the best. There is a
variant though, called a "pocket door" and various companies do special
frames that integrate into a drywall - but can cost a small bomb.

The eclisse link I posted is for pocket doors, £269 or £275 for
metric/imperial sizes, no doubt the ones with glass or curved or
telescopic doors *do* cost a bomb.