when you say good sized plastic do you mean the egloo? If so it is way to small for bunnies they are also not very well insulated so get hot in summer & cold in winter. Unless it is also very good plastic you will find that after a number of years the plastic gets faded & brittle.
I would look at rydale, happy hutch or there are a few others on line that do decent 5/6ft hutch & run combinations which is the sort of size you need & if well maintained should last for years, especially if put on patio over the winter months.
you can line the inside with lino using small wooden strips around any edges (to stop chewing) this is much easier to keep clean.