Wow, what a cool paintjob!
Mir'wer is a great name, it's neat that you're using proper Mando'a. I just threw together syllables I liked the sound of.

One suggestion to keep in mind as you pick a last name is the number of syllables. Mando names have a tendency of having three syllables: Boba Fett, Jango Fett, Din Djarin, Paz Vizsla, Pre Vizsla, Koska Reeves, etc. Though this certainly isn't a hard-and-fast-rule (Bo-Katan Kryze, Fenn Rau, Rook Kast, etc.), so don't worry
too much about it. I say with a six-syllable name...

For fitting the armor to you, that will depend on if you do 3D printing or sintra. For sintra you could make paper and cardboard templates as Yorwoin suggested, but 3D printing is trickier. There are apps where you make a model of yourself then size the plates appropriately, but I'm not familiar with them.
As far as CRLs go, I'd like to have more folks weigh in, but since you have a Post-Imperial chest plate, I think you look good for that era so long as you have one more lower body plate (a kidney plate or tasset could be hidden from view here). I don't anticipate the visor shape being an issue; you fit the 2/3 rule. I'm not familiar with the helmet base, so make sure it has keyslots in the back!
I noticed the cape is a different color around the neck -- do you have a cape design in mind?