Yeah, definitely okay.
I'm not sure of the size of that one, but best to do a minimum of 4 feet long by 2 feet tall by 2 feet wide.
This is basically a convenient build size because plywood comes in 4X8 sheets, so it gives you enough to do the whole viv.
My preference is to make the top removable, but you don't have to. It's a little easier to just fasten it all together, but IMO a removable top makes maintenance a lot easier. Also I like having the lights on the outside, which you can easily do by just cutting a hole or holes in the top and using wire mesh over the hole to hold up lights. But to each their own, that's just my opinion.