A little high, son loves to take off the top

When we first started potty training we thought this one would be best because it looks like an actual toilet and when we move to the real thing it wouldnt be as scary plus he always copies us. That all was true. Only issues with this is that its bowl fits in two ways but the seat will only fits one of those two ways and to my big boy, he will just slam the seat down and the seat pops off. It was a little to tall for him when we first started. The other thing is that he loves to take off the top piece that flushes and throw things in that cubby spot up there which isnt all that sanitary to a boy whose learning and likes to find different things to pee in (thank god we are over that stage). But everythings gone in there, from his blanket to snacks to toys and to pee which leaves me cringing. I cant get this thing clean enough and he was too little to understand that. There are other pottys we have that i feel were a way better investment