My new rabbit

adopted it recently, he has inborn back leg problem, can't jump and walk.
should i not give him a litter box or cave in cage?
should i just use vetbed? is it hard to clean urine and excretion.
is it true most of cage is one floor only and why?
if i go vet general check up as well as his leg problem how much?

leg problem may need X-Ray examination +  consultation fee around $200-$300 =  around $1000
Better to use one floor cage, as you rabbit cannot jump and walk, one floor is safe.
Buy a large flat cage, large area, less stress.
You can buy several vetbed, when one is dirty, wash it and replace it by another
Coud it climb up to the litter box? If not, I suggest use 尿墊 (if it would not bite)