PixieBumbles, your dislike of hospitals sounds similar to mine. I didn't fancy being shoved in a car while having contractions and I also didn't want to be stuck on a ward and my DH have to leave me after visiting hours, when I was likely to be tired, emotional, sore and a bit overwhelmed!
Also, a waterbirth isn't usually guarenteed at hospital, as they often only have one or two available and only a few staff trained for it. I didn't want to take the risk of it not being available to me at the time. At your home, it's your pool and they can't stop you from hopping in if you feel like it. 
Are you a house or a flat? Is it modern or old? They don't usually recommend having birthing pools upstairs in older/rickety houses, not sure about flats though as the floors might well be stronger. You could always see about getting a structural engineer to come and check it out.
We had a solid frame pool last time on the ground floor of our floorboarded house and it was absolutely fine. (We've moved since then and the ground floor is concrete now.) Recommendation is to put it in a corner if possible, as the floor frame is likely to be stronger there.
You can get inflatable pools, including smaller ones, which might suit you better if space is a premium? They are meant to inflate pretty quickly. The MW's don't need that much space to work in, babies are sometimes accidentally born in tiny bathrooms and they manage to cope. The main thing the MW's need is a table/worksurface to set out their kit.
I had a home water birth with my first and I was probably about the same as you with BMI. None of the MWs batted an eye. The birth was very quick and easy, I needed some stitches but they did them at home for me. At one point I had four MWs attending to me - bet I wouldn't have gotten that ratio of care at hospital! 
If you're thinking of a home birth, I'd go with that and tell your MW that's what you'd prefer. It's much easier to switch from having a home birth to going to hospital or the MLU later on than it is to switch to having a home birth at the last minute!
Hope everything goes ok with the consultant later, Bornin.