Quick and tiny post, I finally got the new heatbed in! It's a 300x200mm bed and should work perfectly for this application. Unfortunately, I do have to re-do my previous bed design because it was meant for the standard 200x200 MK2A beds, but it should only take me a tiny bit longer. Another cost that I have to eat is getting a new bed holder plate CNC cut or waterjetted- the CNC machine at my school is far too small to handle that, so I am just going to have a professional deal with it.