Let me start by saying that after looking around the net for a while, the GW terrain kits are a deal. I recently put together the Basilica Administratum kit & think it's great. Below is the way I assembled it to get the most out of the kit. When finished, I ended up with a good sized 3 story building and 2 barricades. Here is how I did it:
1) start
by building the pic from the directions below while leaving out the highlighted apportions.
2) With the left over parts I was able to make these barricades:
