at that price i'd assume they are used. so they may need a bit of spray paint. at that price it's no doubt worth the gamble. a lot of businesses nowadays make a living going into sites that are about to be demolished and cart out as much usable stuff that they can, and then sell it at a discount. i've gone that route for lighting before, especially just to buy the fluorescent fixtues themselves (ie no ballasts, bulbs). you can use these fixtures to house your ballasts in your stand (once you lift 4 ballasts, you'll understand why you might want to avoid having them in your hood).
a diy hood to house the fixtures isn't really that hard to build. i should have my step by step pics posted in the next day or 2. my design is pretty simple, and the old tried and true piano hinge method is perhaps easier. it all depends on how refined you want the end product to be. have you thought at all about a design? what tools does your lesser half own?