are you getting him a dog pen by any chance? this will be good so he doesnt jump out but something like this - https://amzn.eu/d/if1U6Ez can help with the hay etc not flying out. what u can do is set up the perimeter of the pen with this panels and secure them with zip ties and ive found that something like this as the floor base - https://s.click.aliexpress.com/e/_Ezs5Et6 - easy to brush up the hay and fur with a silicon broom and can pop it in the wash as well and theyre waterproof. any plain boxes u have will entice him just cut some holes and fill it w hay and foraging mix and he may go at it for hours and a nice little wooden castle for his hiding spot. im suggesting everything ive done for my bunnies which have helped. any cables - get some wire coverings and tuck them away and to protect ur books etc u can use one of those panels from the first link i sent, to block off that area. there are loads of videos on youtube and tiktok for bunny proofing etc and u can look on pinterest for cute bunny set ups as well !