Body hair will depend on your genetics. My dad was relatively hairless however my mom had leg hair. I tend to lean toward my father's lack of hair except that I ended up with hairy legs. As far as head hair, both side of the family had pretty good hair but if your worried about losing it, there are medications you can take that will prevent it. Talk to your doctor about it if you are interested.
Spiro has little influence on breast development so on estradiol you should see some. How much will depend on genetics but after 6 months you should be getting an idea how responsive your body is. It will take a couple of years to 5 years to determine how much development you will have. If you are showing growth now, you can expect more even without Spiro.
As for a function bottom, if that is your primary goal, the doctor could reduce your Spiro dosage allowing your body to function while still retaining relatively low testosterone levels. This would have to be monitored with blood tests to hit the correct dosage but it could reduce dysphoria, reducing the risk of hair loss while still allowing you to function.
As always, the best person to discuss this with is your doctor as your doctors will know your body far better than we do.