Hey, Demon. Those answers would be yes and not yet. It definitely JSGME compatible (I can't imagine a mod other than an application that shouldn't be JSGME ready
). And nope, it's not available for use in a career yet. It can be used in any of the single missions (a couple come with it) that start on the surface. That's part of the reason that it's not available for career mode yet. New missions need to be written specifically for the boat (since it really didn't serve the same functions as a sub or have the same range) and the whole career put together.
We're hoping that these things come together soon, but we still have a lot of work to do on the model itself and the damage model and all sorts of things that we haven't encountered yet. Right now, it's more of an interesting toy until we get the rest of it put together.
Thanks for the interest and enjoy it when you get to play with it