Back from Bahawalpur. All during my trip I have been thinking about the racing stripes for the Jag

Regarding the question you asked about the sides and bottom of the meter box, I really can't say. Here are a few ideas:
1 - Just leave them open.
2 - If you don't like an open look, then below is a design that will enclose the meters fully. All parts are metal for easy welding, sanding, putty/filler, paint. For the top, you can use fibre glass or metal whichever looks better.
The bike looks breathtaking. My son who is an architect and has an eye for shape, proportions and lines loved the styling.
My favourite picture is the following one. It captures the essence of a cafe racer.