If you want to understand what you can do with trimming, you need to acquaint yourself with all of the the major components and the compendium. From there, you can determine what additional wiring trade-offs you want to tackle, and what notches you can cut into it to fit your needs.
We decided on the OMGWTF because of its relative shape simplicity and small size. There are no inward facing cuts, so it's a lot easier to reliably sand to rule out cross-layer board shorting.
Most everything we left on is there for a reason. The only trim currently confirmed to be working properly past the OMGWTF trim is the LMAO trim, and even then, it needed the preamp and some video junk reconnected to it in order for the output signals to be acceptable.
So in reality everything past OMGWTF is still a work-in-progress.
Anyways, don't cut it smaller just because you can; there's a lot of value in keeping as much intact if you don't need to cut it.