the top to bottom approach

I'm in a bit of a post project vacuum, so I did this drawing yesterday. I started at the top (minus the animals) and worked my way downwards. As I worked my way down, enjoying the ride but when I got closer to the ground I got in problems. How to finish it? Shall I turn the building to some kind of vehicle? (No I did that the last time) Shall I put the building in water? (not enough paper left). Well I have to return to the critter trick, put some fairly exotic animals with large bulk in front of it. Mission accomplished, color (or maybe coffee) to come..