Based on the idea of creation, you could create a computer if you understood the insides of a computer, therefore, a skill check would be required and also, in order for it to operate, after you've created it you would need to program it with an operating system and software. I think that would only be fair. How can you create something you don't understand. Or you could imagine a super computer in your head and your creation could look like a computer system but on the inside will most likely not be if you don't understand what you're doing. These are just my thoughts.
Now you can understand why these Corporations have done so well. They coulddo far more but given the fact they're trading on the world stage, if they came up with things that are far too advanced then people may becom far more suspicious.
As long as you're not trying to destroy the school or trying to creae things that will lead to the destruction of the school, such as equipment larger than the room/corridor...well, destroying th school is something I'm hoping to avoid.
Other than that, I'm a firm believer in giving people freedom with their creations. Just remeber that the things going on at night are essentially world breaking in a way so what's a bit of potential game breaking. You have points to spend and how you spend them is up to you.