We dug ours on one side and built up the other too! Has worked just fine, also ended up using a laser level and double checking with a water level - there's a great thread with great tips and help from wonderful people here on my whole leveling experience. We used those edging blocks you see everywhere to hold in the built-up side. I can take a pic too if you want.

Amy

D1Dave - ours ended up settling with about a 3/4" difference too!