Next step is to make a 1/8 ply box to cover and protect the internal circuit board.You can make it so it just fits over the board 1 1/4" deep glue it with wood white glue and make a hole in the top R/H corner at the back for the panel power cable.

When dry mount your panel with nuts and bolts and dry fit cutting away the wood were the nuts are. When you have done that run hot glue aruund the box face and fit to inside (be quick it goes off quite quickly)

Run the hot glue gun over the joints you can see and corners to seal.

Go to Pic 5