Anyone can do this!
I paid $25 for a cardboard 2 story + roof house at a House Rabbit Society convention when they used to have them in New Rochelle, so I think of it now as a donation since that is quite pricey.
All those cardboard boxes from Amazon or Chewy are $0 toys. All you need is utility knives. I don't use tape or toxic glue because of the chewing. Boxes, are cheap toys for kids and pets. After the shredding, you can recycle!
My granddog likes to tear up coffee carrier made of paper. Long term entertainment at bargain prices.
2 story cardboard rabbit house - Google Search It might take a while before they start exploring the house, but they will. They might stop for weeks and start again, so if you have the space, rotate boxes of different shapes and sizes. Boxes that hold liquor are usually sturdier, and retailers flatten their boxes for disposal. Easy handling and ready for reassembly.
Now I want to go work on a house for the young bun!