OK k8 I want a few inches, your peeter and your BMW thanks!
Somehow K8 I can't see you as male, you're just a very cool lady.
One thing gals can do for bone mass preservation is weight-bearing exercise. By this I mean stuff like the squat, the bench, the deadlift. The estrogen regimen should give you only the muscle-mass capability of any other gal, which means you won't get big muscles, but you'll do your bones a big favor.
The other thing I'm thinking is, a good calcium suppliment. But those are expensive, so one thing I am thinking is, save eggshells. When you have a bunch, put 'em into a blender or coffee grinder, and powder 'em. You can even do this by hand. Then stick into empty gelatine capsules you can buy, hey presto you have an expensive calcium suppliment for cheap. Take one or two a day, they're eggshells, not gonna hurt you. Priced OsCal or CitriCal lately? Ouch.