Well I did (almost) exactly the same - and I loved it. Had a ball.
I bought a well used 13 footer - 400 pounds sterling - then spent a couple of hundred wiring it up with mains power outlets. Fitted it out with colour television, VCR, microwave, toaster, kettle, electric lighting, fridge - everything I wanted.
Dragged it down to Bournemouth - pleaded with a few caravan parks for a good rate (played on the "poor student - needs to study, no parties, angle). Ended up paying 1 pound per night if occupied, 50p per night if empty (including electric hook up).
I left one sleeper sofa as a sleeper (duvet and comfy pillows), one as the sofa. Very comfortable.
Had a car, so still managed to get out and about (shopping and socialising). Had a great time.
Drove to the van every Monday morning, drove home to wife every Friday evening (Manchester).
Have to admit, my course was what would be known as modular groundschool - and was "only" seven weeks long - but I'd have done it again in a heartbeat - and, as you say,.........
it saved me a fortune financially.