Depends on the size of your car roof. This one measures 33 inches wide and 37 inches long.
Is this the half size roof box, rather than the one that takes up the whole roof?
Yes you can.......................but you have to saw the lid off first X)
Anyone know if you can use it without the lid, like a basket?
You're right there! The two cross bars seem to be in the £40-60 range and the fittings another £60 from places like Halfords and even on the net. The Automaxi range appear to be the cheapest I can find at about £40 complete depending on your car; but I'm still looking