Beth,
I don't want this to sound mean, but you really should start thinking about what the priorities for your pets are. It sounds like you and your mum have struggled with money for getting Bandit sorted, and animals are so unpredictable that there may be another emergency just round the corner (I hope there isn't).
If you do want another hutch for your piggies in the summer then I would think about it nearer the time. I know you love your pets but acting responsibly is a major part of being an owner and I don't think that under the present circumstances buying another hutch is the right or sensible thing to do.
Putting it really plainly, that hutch won't be much good if things go wrong and there are no piggies to put in it by next summer.