You'll have fun with the 1g batch I think. Especially if you really enjoy the whole process of brewing (which I think most of us do) as much as drinking the finished product. Some say that it takes just as much time and you don't get as much beer, but I really do think it's easier and more manageable since you can easily cool in an ice bath and clean up faster.
You can get a pretty good idea of your boil-off rate before you start by boiling a gallon of water and seeing how much you loose over a set time. I think it should be pretty linear so if you boil one gallon for half an hour and see how much you lost, double it and then determine what percentage you lost, you would have a pretty good idea of what you'll loose from your one hour wort boil...or you could just go with 1.5 gallons preboil.
Are you planning to mash your 2lb of grain and then drain, sparge, add DME and boil? I generally just do AG all the way so I'm not adding any extract but I don't think that would change the process.
Thanks for asking about the fires -- they're about an hour or so away from me so I don't detect any smoke...I'm hoping it stays that way. I'll be getting out of this dry weather next month and coming to your part of the world -- my fiance and I are going to Poipu for our honeymoon. Maybe I'll pick up some indigenous ingredients to bring back for brewing!