If you want a safe place type affair, rather than something your bun will be locked in, then there are definitely ways to make crates look more appealing, and even furniture designed around hiding a cat litter tray that might be of interest.
My buns have a rabbit proofed room and I use puppy panels if ever I need to restrict them (for instance, for bonding), they don't have a specific bolt hole (they did but it's gone back outside as they never used it) but they hang out under the bed a lot.
When I get my giant I'll be back to using the big carrier for separate feeding because they can let themselves out but not in.