That's a great quality scan from Kyle. Really grown fond of 150s over the past few years. They're uniquely constructed, but once you've played with a couple, you can tear into one pretty fast.
Think the hardest part for myself was reconnecting the throttle and choke linkage when putting the carb back in. I've found its best to slide the choke all the way forward, connect it first, then angle it so the throttle linkage can connect, and connect the fuel line last. More than once than once I've forgotten the gasket between the carb and the housing. Ask away if you hit any snags along the way.
Dan