This is my watercolor copy of an obscure Normal Rockwell painting called "The Mermaid". I'm showing it here because of the frameless, glassless mounting. This was a fairly large painting (18"x21") and adding a mat and frame would have increased it to about 26"x30" - too big for my house.
The backing is a shallow box structure using 1/4" BB Ply as the surface and 1/2"x1" red oak for the structure. The watercolor paper is glued to the BB Ply using Acrylic Gel, and the watercolor is varnished using Krylon Kamar - UV resistant varnish meant for surfacing paintings. I reduced it to 16"x19" by trimming some sky and earth around the edges.
This mounting saves a lot of space, weight, and cost. I have not tried it with any scroll cuts, but it might make a nice contrast mounting.