Hey there! Your Bentley looks similar to my Buttercup. So cute!
BC is a major digger/chewer. I had to keep my eyes on her every second. I was advised by her vet that spaying her would quell a great deal of this impulse, but of course it didn’t fully eliminate it. I tried the bitter apple spray and other suggestions mentioned online to no avail, so here is what has worked for me. I’ve also discussed this with the vet, and so these are mostly her suggestions.
As previously mentioned, bitter apple spray went over like a lead balloon. It was suggested that I try a homemade type of vinegar spray, because bunnies are supposedly rather offended by vinegar, but not mine! So, it was suggested that I try the Keep Off stuff that is actually used for cats and dogs to keep them off the furniture. So far, it has worked great! I always spray the places that I want her to stay out of before I let her out, just so she won’t inadvertently inhale any. The first time she went towards an area that I had sprayed, she stopped in mid track a good distance from the spot, turned around, and kicked imaginary dirt towards it LOL. After about a month of consistent use, she doesn’t even bother to go in this particular corner anymore, so I don’t have to spray it there any longer. It is the indoor use kind that you can find in any pet store. It smells quite similar to cilantro. Doesn’t stink per se, but it doesn’t smell like air freshener either.
As far as bunny proofing goes, the spray would probably work just fine for the floor boards and corners. BC doesn’t chew on the walls; it’s mostly the corners of rooms (and furniture!) But just keep in mind that wherever you spray they will not want to go near that spot, so I don’t know if spraying the floor is a good idea or not.
My bunny literally eats plastic, so I keep all plastic away from her. I’m afraid she will develop some horrible digestive track problem. Metal isn’t good for bunnies either per the vet, so if you want a good floor for your free roam spaces, I feel that the plywood is a good choice. It’s cheap, you can get large pieces, and if Bentley scratches at it, it will maybe file his nails
Another cheap suggestion for chewing: BC gets all of the empty toilet paper and paper towel rolls. She also likes paper bags. She has a cardboard box that I keep everything in, and she digs and scratches at that. It gets messy, but I’d rather clean up cardboard pieces than any alternative.
She also likes cloth, so I’ll give her old clothes and blankets to push around and dig at. That seems to keep her occupied rather well. She doesn’t tend to eat/chew these, but that doesn’t mean other bunnies won’t.
It’s a game of trial and error, but you’ll eventually find out what works best for you and your bun