I would do an EMT conduit frame (plenty of dome calculators out there to do the math on cuts) and cover with chicken wire and screening. It seams simple enough.
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi.
"Family farms work when the whole family works the farm." -- Adam Klaus
If you order a kit from a reputable company and do a good job on the roof it shouldn't leak. There are many ways to make sure that there is no leakage, sealing with silicone between plywood seams. I have been researching domes for quite some time now and have yet to read about a well constructed dome that leaks.
Gluten free is a good point, Dawn, but I would go a step further - read "the Body Ecology Diet" by Donna Gates. There are so many possible causes of fibro, and this book addresses nearly all of them via food. It has changed several of my clients' lives for the better, and one of them said her transformation was nothing short of a miracle.
Yurts are a great option too, and you can get one for between 5-9K that works for all seasons. Mongolians have been using them on the Steppes for centuries, and many folks swear by them. Best yet, they are "temporary structures" with no foundations, so building codes don't really apply to them (like a camping tent).