How are you sourcing/getting metal trim?

As I look at the builds on here and on mfgr websites it looks like the ATP and/or metal trim is always done so well! I suck at making clean cuts on wood so I'm even more nervous at the idea of cutting/bending finishing metal work. So, I'm wondering how you guys did it or if you just took your trailer to a fab/metal shop.
For example, my trailer will arrive like this https://i.imgur.com/QisvOSs.jpg
(credit to Trick from this thread viewtopic.php?f=42&t=70738)
I would like to add a nice flooring to it and add ATP or aluminum/steel trim to make it look clean, like this image (specifically the trim around the ramp and to a lesser extent the floor along the wall)
.
Thank you guys. I really appreciate how helpful you all are!
Cheers!
For example, my trailer will arrive like this https://i.imgur.com/QisvOSs.jpg
(credit to Trick from this thread viewtopic.php?f=42&t=70738)
I would like to add a nice flooring to it and add ATP or aluminum/steel trim to make it look clean, like this image (specifically the trim around the ramp and to a lesser extent the floor along the wall)

Thank you guys. I really appreciate how helpful you all are!

Cheers!
