what are the white things holding on frp? also where did you get the corner sheet metal?

What you are asking about are 1/4″ plastic pin rivets. I got them at Menards cause at the time Home Depot didn’t have them available when I got the frp from them. I complained to them and told them that the manufacturer of the FRP they are selling recommends installing with both FRP adhesive and the plastic pin rivets. He told me he never saw it installed that way and referred me to Fastenal. Well I already knew Menards had them but wanted this to be a one stop shop. I gotta tell ya, my complaint worked cause I was just in Home Depot like 2 weeks ago and BAM they now stock and sell them. 🙂
 
If you have followed my thread you know that I installed adhesive the first time with a crappy wall covering product then ripped it all out then re did it with good FRP. Well when I put the good stuff up I only used plastic pin riveys and no adhesive and it looks and works great. No sagging or bubbling of any kind and much easier than applying adhesive.
 
The corner metal you see on the interior walls is like .050 aluminium that was installed as a finished product when I bought the trailer new. I saved it for reinstall and reused. The reason they used it is cause in the front of the trailer the corners are rounded so this was easier than rounding out some sheet metal and in the rear there is trailer wiring running behind it. A sheet metal shop could easily bend some of the stuff for you if you wanted it. My local sheet metal shop stocks all gauges of aluminum and stainless.
 
Just an update to my post:
I had my state of MN electrical inspection done last week and past with flying colors. He said we was impressed!! 🙂 🙂 🙂
I also had my state of MN Health Inspection done and also past with flying colors. 🙂 Felt soooooooooo good getting that out of the way let me tell you guys!!!
 
I had a practice run on some food over the weekend for my sons birthday party and it was hectic and I learned alot as to where I need to improve in terms of quality first and speed second.  My first event of the season is in less than 2 weeks.