Mullie, I like this layout very, very much. Keep up the good work!
Regarding your last photo I suppose you used the lens set to wide angle. If so, then the "dip" is no surprise. In fact, you will observe a "counter-dip" above (see "Wythe & Sons"). This effect is called "barrel distortion" and is due to the geometry of optical rays - and therefore connected to wide angle photos. (Some quite modern digital cameras automatically calculate this effect out of the picture.)
Regards Armin
edit: Counter measure: set the lens to a middle focal length - the distortion will disappear (yes, I know, you will have to step back a lot…).