In the lower 48 we might refer to that as "First World Problems".
In your neck of the woods, that might need to be downgraded a little bit.
I'm sure it will turn out great when you are done.
Cut .060 rabbets in the rails so the rails are .020 proud of the tin, mitered the corner, then milled a bevel on the top and bottom of the rails.
Glued and screwed the rails onto the counter and lastly glued the tin down.
