2 months is not a realistic deadline, especially for your first build. I can easily end up being a year before you get it finished. But it all depends on how much time you can invest in it on a daily bases, and how motivated you are.
The only way you could get it done that fast is if you really work hard on it every day. You still have a lot of learning to do, and this is where most of that time is going to be spent.
If you really want a fast, more user friendly build, I would go with EVA foam. Just look at what other people have accomplished. You can still do amazing detail. It's lighter, some what flexible, and therefore more enjoyable to wear. It still is very resilient, maybe even more so than bondo, think about it, if you strike a bondo piece, you will chip the paint and leave a dent, with foam it will just return to it's original form.
You should really look at other threads involving foam, and soak up as much as you can.
Here just one pointer:
Link