A little Monday post work cyclekart building as my perforated alloy off cuts came through the post and I just had to.
 From a distance it should look pretty unnoticeable especially as the angle your eye can see it reduces as you are further away. When it is all painted up. I hope it will provide a cooler engine bay as I read overheating can be an issue with a covered engine bay - anyway, we will see in time.
The off cuts were not quite long enough for  the job but I need to sort out a boot latch at the bottom end now so I hope I can cover the discrepancy without too much of a visible join. Failing that I could try and match in a couple of pieces from what I have left. 3mm alloy with a 5mm hole - probably weighs less than 2mm alloy and it has taken the compound curves of the boot well.