1. i use melamine. it comes in 4x8 sheets and you can get it cut at the hardware store.
2. i use belly heat, some use back heat. I think belly heat is better especially if your room is a little on the cool side.
3. go without lids. this is not a hassle at all!! with lids you have to pull the tubs all the way out, put them on a work surface and then take the lid off. without lids you pull the tub out far enough to work in it and do your spot cleaning or feeding.