The low slope single roof has some real advantages including placing upper level windows.

Expandable Design #5

Expandable #5

Comparison: Designs #5 and #6 share a look set mostly by the low single slope roof use and theme. Their plans and the their expanded plans don't really share anything. Design #6 spreads itself out similarly to most plans and therefore is more mix and match compatible with those designs.

This design: The utility wing this main level projects forward which makes this this well suited to narrow or infill lot situations, particularly with single lane parking on the left - parking shifted to the front. The master wing in the expanded design changes this potential.

Style: As drawn this design has an easy contemporary look.  An advantage to the low slope roof configuration is the larger window potential on the upper level which enjoys larger horizontal window openings.