Is my baseboard strong enough? (Pt.2)

Just a quick update showing what I've constructed for my baseboard. The final configuration will have the right section sitting lower than the left section to accomodate valleys and the small creek that will run beneath the viaduct. BTW, from the plan on my previous blog, I have decided to do the mirror image of it, which is why if you look closely, the actual baseboard is inverted left to right compared to the original plan.

Here are the pics: