This is a community where INTJs can meet others with similar personalities and discuss a wide variety of both serious and casual topics. If you aren't an INTJ, you're welcome to join anyway if you would like to learn more about this personality type or participate in our discussions. Registration is free and will allow you to post messages, customize your account and use other features only available to our members.
Well then you could do a manure pack to create raised beds in stages. 4 feet wide, 4 feet long, 4 feet deep; there's a raised bed, ready in 2 years... do another, and another, and another. Right on the gravel so you take advantage of that good drainage. And bob's your uncle.
About an acre and a half for the backyard -- most of it is unusable primarily owing to the fact that much of it is gravel. The parts I use I had to shovel out and filter out most of the rocks over several weeks.