Is the boy bunny already neutered as it's quite possible to bond an unspayed female with a neutered male (he must have been 8 weeks from neuter though to be infertile) - but it rarely works the other way around, with a neutered female and unneutered male, as he will probably hump her so much she'll start fighting when she's had enough of it.
I would say regards hutch size the hutch on ebay isn't deep enough or tall enough - if it was 2x4 and 40 high then maybe but the thing is she MUST be kept indoors after her spay and nursed intensively for a few days - it could be the difference between life and death for her, so you will need indoor accomodation for her somewhere warm too, like a dog crate.
Also if she's cooped up in a 2x4 hutch over run she will not be getting enough exercise to be healthy - her guts are liable to grind to a halt without a good run about twice a day, so ideally pen off an area of patio she can run on for half an hour twice a day, just to stretch her legs, or as she will need to be in the house post spay, you could just give her a pen indoors from the start maybe?