Hi,
if you wachted A. Kramers tutorial, you know what to be done.
if footage is shaky i´ll perefer stabilizing the footage an then motion tracking. in the areas where wires covering the biard, i´d try that with mattes (luma mattes,etc.)
i think your footage ins´t pretty much hi res, so in the end it needs a lot of tweaeking like color correction of your billboards so that they fit perfectly (unvisible composting) in the scene.
and because there is no straight way to answer how to achieve several composits, watch a few AE tutorials here at the cow, i´m pretty shure you´ll find the right way.
cheers