I am new to the RPF, as well. I am a budding Mandalorian, myself, and I have to say that this is impressive. Good job, man.
Trash cans are a great way to start out for the Mando armor, if you are just a beginner. I, myself, didn't make my own. I bought a kit that is made out of Sintra - which is another material that I would suggest using if you are a beginner.
Sintra is also known as expandable PVC. I can come in various thicknesses and colors. The nice thing about it is that, due to its molecular properties, if you mess up forming the plastic, you can just heat it back up to reshape it again. Other plastics aren't as forgiving.
I've heard that the downside to Sintra is that it can warp in the day heat - this is, again, due to its unique molecular properties. However, I just did an event a week, or so, ago in 100+ degree weather but I didn't have any issues with my armor pieces having any warping issues.
So, there you go....
- Bill