TJC here, reporting live from the T Moulding World Expo, here in sunny Honolulu. Week 2 of the expo is kicked off to a great start with a beachside clambake Luau, All the T mold players are here, and absolutely NO T molding is shipping Anywhere in the World!
Now on to the real comments!
-3M vinyl CF is stunning. I probably would have bought it for my cab if I had realized at the time that it actually has a 3d texture. Very nice. The ones I saw also had holes all the way through between the weave which concerned me.
-Since you're going with a lot of VPin action in your cab, consider keeping the 16:9 monitor. We all have scope creep from time to time but It would be a shame to redo your lower section completely. Save the 21" for another project. At that size, it's good for a fixed monitor cab if you do another one. Whichever way you go, I'm sure it will be well done.