There is a method that will allow you to do something close to this, or at least have somewhat of a start to expand and then refine. It's a lot of work, for you have to make each separate hatched segment individually.
First, create a symbol of your hatching pattern:
- Draw a very slender and wide horizontal triangle;
- Alt-drag it to copy it, aligning the copy's top neatly with the original's bottom;
- Choose Object > Transform > Transform Again (Ctrl / Cmd+D) a few times;
- If you want to be really thorough, add halved triangles on the top and bottom;
- Select all triangles and drag them into the Symbols palette.
Then, map that to a 3D shape:
- Try and draw a path that will match the element of the letter you are trying to produce. This will take some experimentation;
- Give the path a light stroke colour -- white works just fine;
- Choose Effect > 3D > Extrude and Bevel...;
- Besides choosing to extrude for a non-zero amount, choose the Map Art... option to choose a surface and a symbol to map onto that surface.
Tweaking both the mapping settings and the path should yield an editable object where you can position your hashing to your desire. Once you are somewhat happy, you might want to Expand everything to fine-tune it manually.