I think non idealized is more than welcome here, but for actual membership you will need to stick to the CRL requirements.
Sure there were troopers without stripes or this and that, but we all know that there were non-intentional flaws.
As a unit we need to try to look somewhat uniform in some shape or form.
This may sound silly but I think those "cannon" flaws may only be acceptable at non-cannon troopings?
I'm pretty sure you can get away with smaller details. One of our staff members troops with some "tape" on his belt as seen on one trooper in the movie, though I forgot who.