As for most piece of shop furniture, there isn't really any plans to go on. That's because each and everyone of us has different requirements, there are no one size fits all!.
To get a sense of what I needed for a plane till, I tried to rationalize my herd of planes to the ones, I thought I should need the most; I got it down to 52 (ish)! Go ahead laugh, it's just that I have so many to pick from :-)
This is an all important step to ensure that you have a sense of the requirements. You can also leave some room for future expansion as your needs grow, but you can also build more and bigger storage later on , so go ahead and built it now! Once you understand the design process it is easy to adapt it to what YOU need.
Next I looked at my smoothers and selected these 12
Why so many? Because one can never be too smooth :-) NO really, it's because it gives me various angle for the blades from 45 to 60 degrees and various shapes as appropriate to the task
Block planes, I picked 9
Next I look at my moulding planes and special planes and sort them as such
Joint making 9. Moulders 13 and counting?? Complex moulders 2.
Next I simply Google "Plane till" and looked at pictures. I pretty well had an idea in mind, but it is always a good thing to look at other's work.
I quickly settled on the tilted plane idea for the long ones and separate cubicles for the others.
The two rows of separate cubicles will have inside dimensions of 3 inch wide X 6-1/4 in high.
There would be 11 separate cubicles in each rows.