If he is paying for it you should make it according to his latest request. If it is a gift you should feel free to combine his wishes with your creativity. IMHO
I recommend just seaming your fabric together. Straight lines are fine if you aren't comfortable with curved seams. Put the curves/hills in with quilting. At least one of the seams will probably be partially covered by the house anyway. Illusion will take care of the rest.
Last edited by ShirlinAZ; 10-21-2013 at 05:40 AM.