Hm, Highlander....I agree with you that being overweight increases risks, in pg aswell as normally, I suppose...however...tbh., I can not grasp (possibly stupid, I know) how BMI really can give you guidelines on anything....because, it misses so many imporant factors...forinstance men, naturally have a higher muscle ration, and of course each individual will have different muscle fat ratio...it also does not take into account where a person carries most of their fat, which is, surely you will agree, fAR MORE TELLING IF YOU WANT TO WORK OUT RISKFACTORS... ooops caps, sorry....
For those reason I really , personally, think that BMI is quite a rubbish tool....
Also, a 6ft size 18 woman, personally would not strike me as that severely overweight,as in risk factors increasing that much
FWIW, a friend of mine, she must have been 5.3 who was a size 16-18 had no problems to get a HOmebirth dispite the fact that her previous 2 Baby's were on the larger size....
In the end, OP, it is your decision and aslong as you are aware of all the possible risks than really it is your decision....of course you have to consider all possible consequences, etc...but it is your right to have a HB, and by your OP (have not read anything bar OP and last post by Highlander) you don't seem to be unreasonbable or anything in wanting a HB....unless there are other riskfactorss, etc...