When I built my plane till I first built it much flatter to the wall. I did some experimentation to show that the angle was sufficient for the planes to stay in place. What I didn't calculate in was the 'pucker factor' every time I set a plane on the till and just wondered if this would be the time that it would fall off. After a week I hadn't dropped a single plane, but it was wearing on my nerves so I rebuilt it with almost twice the depth. This causes more 'shadow' over the bench, but it's worth it both for my peace of mind, and for the extra shelf space below.
To the left we see the plane till. From left to right, top to bottom, we have a Veritas Bevel-Up Jointer, which I use as a try plane, not a jointer, and old Stanley #6 which I use as a fore plane, a Veritas Low-Angle Jack plane, which I use as a fitting plane, not as a levelling plane. Next comes the Veritas Bevel-Up Smoother, the Veritas Scrub Plane, a Veritas Low-Angle Block Plane with the extra tote and knob to turn it into a "#3 Smoother", Veritas winding sticks, a Stanley G12 low-angle block plane that I bought, perhaps, 15 years ago, and a Veritas low-angle block plane which normally always has a Veritas Chamfer Guide on it. On the shelf below we have a Veritas Router Plane with all of the trimmings, a Veritas Small Router Plane, a Veritas Jointer Fence for the Low-Angle Jack, a Veritas Small Plow Plane plus the blades, a Stanley #78 Duplex Fillister plane, and a Veritas Small Shoulder Plane.
Attached to the side is the piece of 2x4 that I use as an index for my augers, and that stick hanging on the tie peg is just a piece with different sized holes in it (all bored by my auger bits) which helps me figure out what size hole I need for various applications.