Sorry Lazy, call it my ADHD or just senility, but those stripes are driving me crazy, I assume you downloaded the model from 3DW (or created it yourself), in case you would also prefer this, download the latest version (Sketchup File, not Collada) and use Eneroth's Open Newer Version plugin.
If your first cut is too short... Take the second cut from the longer end... LBD