Reddit mentions of iPrimio Cat Scratch Ramps (2 Ramps for One Price) - Foldable for Travel and Easy Storage - Great for Cats Playing Over, Laying, and Scratching - Patent Pending Design (2 Pack)

For the walls you can secure some cardboard around it to protect it or use NIC grids connected with zip ties to make a soft of fencing you can place all along the baseboards to protect from chewing - with the right color it doesn't hugely standout and with time the bun might lose interest and you may be able to remove it.

You can also try to use some sprays that are vinegar based homemade ones (see videos below) to make the baseboards unattractive....

Again anytime you see chewing actively offer a better alternative and reward good behavior (don't scold the bad as bunnies do not understand discipline like cats or dogs).

You can also try something like this tape (but be very careful to be sure he does not chew it!) https://www.amazon.com/CLAWGUARD-Protection-Tape-Single-Sided-Scratching/dp/B073VRR92F/ref=asc_df_B073VRR92F/?tag=hyprod-20&linkCode=df0&hvadid=198060065450&hvpos=1o4&hvnetw=g&hvrand=16242557335742130470&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001880&hvtargid=pla-350443111591&psc=1

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Watch the videos below for tips:

https://www.youtube.com/watch?v=xqWh4vWm7Dk

https://www.youtube.com/watch?v=x_QNPkPbqDk

http://bunnyproof.com/how-to-rabbit-proof-your-house/how-to-stop-your-rabbit-chewing-doors-skirting-boards - great tips here

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Bunny won’t stop chewing everything, what to do:

What might help is a few things:

1. Positive reinforcement - trying to reward good habits with treats and redirect bad behavior like chewing on furniture to good behavior like chewing on a chew toy with a treat to build positive associations with good behavior. So every time you seem him try to chew or dig on something he should not, don't lock him up, but right away offer him a toy or thing that he can chew or dig on... then reward him with a tiny piece of treat.
   
2. This brings me to my next point, purchase or make some alternatives for him to chew, dig, keep him entertained and occupied. A bored bunny will usually chew... There are tones of ideas which you can search the internet for and some I like are below, But the point I am trying to get across is that you need to make a bit of an effort to see what toys he likes and get.make him things to keep him occupied and entertained
   
   1. try to make him a dig box - use any box and fill it with shredded paper and see if he likes it - usually they do. you can also purchase some of those soft plastic balls like for kids and fill the box and he might like that too. experiment, but give him an alternative to dig
      
   2. https://www.chewy.com/petlinks-sea-ramp-seagrass/dp/130165?utm_source=google-product&utm_medium=cpc&utm_campaign=hg&utm_content=Petlinks&utm_term=&gclid=CjwKCAiA767jBRBqEiwAGdAOr84c0JJegjDQvRRYRgRTf1Qr1Gd3p36KnkVhZM_bV2jZy-5DB3MNMRoCKpMQAvD_BwE
      
   3. https://www.amazon.com/iPrimio-Cat-Scratch-Ramps-Price/dp/B06WVK24SL
      
   4. https://www.amazon.com/AMZNOVA-Scratcher-Cardboard-Scratching-Scratch/dp/B076F367WL/ref=redir_mobile_desktop?_encoding=UTF8&dpID=41cqNb-v0jL&dpPl=1&keywords=cat%20scratcher%20corrugated&qid=1541451728&ref=plSrch&ref_=mp_s_a_1_18&sr=8-18 - try this cat scratcher for him to chew and dig also, he may love it
      
   5. https://www.amazon.com/Small-Pet-Select-Digging-Platform/dp/B075VV66MQ/ref=asc_df_B075VV66MQ/?tag=hyprod-20&linkCode=df0&hvadid=198079906959&hvpos=1o1&hvnetw=g&hvrand=5911275993940894665&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001881&hvtargid=pla-370007460458&psc=1- another great thing to dig and chew for buns
      
   6. Small pet select hay awesome toys to keep your bun entertained a bit pricey but will last a while and have great quality https://shop.smallpetselect.com/collections/natural-toys-and-chews-for-rabbits.
      
   7. https://store.binkybunny.com/toys--chews-c2.aspx - great toys here also, try some inexpensive sea grass balls, you can also find playhouses on this site bunnies love, etc
      
   8. https://www.farmerdavepetsupply.com/chew-sticks - these chew sticks are great for buns and you can always offer to him as a very yummy alternative to cords!
      
   9. Make your own toys also -https://www.reddit.com/r/Rabbits/comments/9j3lod/a_couple_people_requested_this_i_wish_i_was_able/ - watch this for how to make a homemade toy for loads of fun. Just hide treats in a toilet paper or paper towel roll and stuff with hay. You can also stuff a paper bag and give to bunny to try to open up and get inside (don’t use tape). https://www.reddit.com/r/Rabbits/comments/9n0li2/egg_carton_with_greens_a_great_toy/ - anther great toy idea: egg carton with greens or hay inside. Also you can put hay or pellets into a payer bag and tie it up and give to bun to figure out how to open. All of these will help keep the bun occupied.
      
   10. Buns love tunnels https://www.amazon.com/gp/product/B07FWC277N/ref=crt_ewc_img_dp_9?ie=UTF8&psc=1&smid=APMR7WBX7KEK1
       
   11. Also try giving pellets in this treat ball https://www.chewy.com/ethical-pet-seek-treat-shuffle-bone/dp/56279?utm_source=google-product&utm_medium=cpc&utm_campaign=hg&utm_content=Ethical%20Pet&utm_term=&car-boost=1&gclid=Cj0KCQjwrZLdBRCmARIsAFBZllG0sQsNiZdMa_Q8wOvVygC0S8qEBHkS9VYaQ_b3Sa6j7AQ6N0UuiLkaAvpAEALw_wcB