Oh, but there is method to my supposed madness. You notice the ramps that the spikes are not placed down? I can easily jump on top of those and gain easy access to all the spikes around the tower. The barbed wire fence I have no issue jumping over. Sure, it's not a long-term design (not a feasible one anyway), but it works decently for what it's supposed to be. I don't mind losing zombie kills in A17 (unlike A18). Also, I'm probably going to install a guardrail along the outside rim of the bars to prevent me from falling off the edge.
Edit: This was after the horde. I was only in fly mode this one time (and the previous time before the horde started) for screenshots.