I have just uploaded a stunning three bedroom design called the FARGO. Check it out on the plans page or download the Fargo PDF here. What do you think? Any good?
What is important with a three bedroom design is to think about the extra people you are planning to accommodate. You need to allow for sufficient functionality in the way of practical bathrooms, dining and other spaces.
The Fargo has a pretty clever main bathroom set up to allow for multiple users at one with a separate WC, vanity area and shower.