Compact Trailer Popup Mechanicals and Corner Moulding

Hello!
I am building a pop-up camper/utility trailer shell very similar to George Teague's GT Compact, David Byrum's Compact Clone, or Jim Teiss's 3 Way Trailer. I am most interested in finding out more detail on the mechanical detail of George's pop-up top. Also, I would like to find an inexpensive source for simple right angle corner molding (aluminum or vinyl) to finish off and protect my corners and edges.
Thank you.
Lou
(Louisnord)
I am building a pop-up camper/utility trailer shell very similar to George Teague's GT Compact, David Byrum's Compact Clone, or Jim Teiss's 3 Way Trailer. I am most interested in finding out more detail on the mechanical detail of George's pop-up top. Also, I would like to find an inexpensive source for simple right angle corner molding (aluminum or vinyl) to finish off and protect my corners and edges.
Thank you.
Lou
(Louisnord)