We obtained the following aluminum profile(Code REH8253) from a chinese manufacturer www.robustcasing.com:

Due to the sliding action and play within the enclosure, the copper was  pulled back from the board edge to accommodate this movement.

PCB with copper pulled back

Front side

Back side

PCB layout on 4 layer board.

Board specifications: 4 layer FR4 1.6mm thickness, ROHS, 1/1oz, ENIG surface finish, Green Solder Mask, White silkscreen legend color.

Top layer

Inner layer 2

Inner layer 3

Bottom layer

3D rendered PCB views right from Kicad

With regard to the 2D thermal array sensor add on:

Board specifications: 2 layer FR4 1.6mm , ROHS, 1/1oz, HASL surface finish, Green Solder Mask, White silkscreen legend color.

Top layer

Bottom layer

3D rendered PCB views right from Kicad