How to create a Flat Top wing element ?

[Kingfisher]

Hi, I am working on an update to my first Lego ideas creation and would like some help or suggestions as to how to create a flat top to a wing shaped surface. I would imagine that it is similar to an aeroplane wing except that it needs to be flat.

My project is the James Webb Space Telescope that has foil type layers for a sun shield. As can be seen in my model, I have managed to get the shape but lack the smooth surface. Higher resolution images (and a video of it unfolding) are available on the Lego Ideas site of you need them. https://ideas.lego.com/projects/05fb57ff-a8d9-4795-8408-32d9e2114dd1

Any suggestions appreciated. 

[Nantucketdink]

Tiles are the obvious solution

[Kingfisher]

I have tried 2x2 flat tiles but they leave a square sawtooth type edge and the joins do not align very well as this surface has a 1x3 angle. Do you know if there are any 1x3 sloped ones as I cannot find any?