Make them 6x wide, start with a 1x tall ramp, then a 5x tall height brick, then a 3x height inverted ramp, a regular 3x height brick, then another 1x height brick. It would look like this;
-----\
|
|
/
/
/
|
|
|
|
|
\
And that's one sided. Also, remember the central fountain, exploding barrels, gardener shed and the picnic tables.
I can't help you because I'm out of town and posting from my iPhone.