The daisy cottage hutch is a small double story hutch which is too small and poor quality to keep rabbits in, if it was mine I would save my money by not buying a cover for it and use it in the near future to upgrade their accomodation.
If you want to do something to insulate it for the time being and to protect it from the weather cover it with a few layers of bubble wrap. which will do the same job whilst it is in use.
To make it usable for rabbits you could get an avairy style 6 x 6 run where you can walk into it, cover the top with a perspex and then remove the door from the bottom hutch so that the rabbits have 24 hour access to the run.