A agree CC - my plan is very similar.I'm not entirely sold on early retirement, in the sense that you simply live off investments. At least for me, it will be great for a few weeks or months before ennui kicks in. I like the concept of Financial Independence much better -- you go to work because you want to do something not because you have to. And if it comes to that you can tell anyone to go to hell. In that sense, a lot of these "early retirement" types are financially independent, not really retired.
I'm personally planning on retiring by 55. I'll probably do a retirement-on-installment-plan deal. Work a few months, take a few months off. Work part-time in the summer months etc.
My plan necessitates investing until age 55 then work only to pay for life expenses until age 60. This should allow for an additional 5 years of compounding. ? full retirement by age 60 although you never know I may continue to work a bit more.
I have built a number of safety margins into my plan... I think.
I am fortunate to be able to take about 12 weeks completely off each year now which certainly goes a long way in helping me 'love' my job.