Do you have a Jollyes near you? I got mine from Jollyes, they are good for several reasons...
1) They are not too deep, loads of the hooded trays I saw online seemed to be really deep and a little kitten might have a job getting in.
2) They are the size of a large litter tray, deeper and bigger than the regular sized tray and Jollyes actually sell 'normal' large litter trays so you could just replace the base with if it got stained or smelly.
3) You can actually unclip/clip back on the hoods easily! When I bought them I tried unclipping the lids of the cat-it ones that they had in there aswell. In the end a member of staff came up to me to see I needed any help as I had been struggling for quite some time to clip the lid back on! They also come with a scoop which clips inside the roof accessible by the flap where the carbon filter (included) lives.
Here's a pic from a US site, can't find anywhere that sells them online in the UK. They were £11.99 in Jollyes and are made by 'Imac'
P.S Can't believe I have written such a long post about a litter tray!