Wind Deflector

I'm about half way through the build on mine. I bought a bumper valance (replacement for stock) for a 4wd truck same year and model (2015 F350). The 2wd version is 4" tall, the 4wd version is 7" tall. Decided to make a fiberglass plate with blind nuts to mount it, that way it is easily removable/replaceable for maintenance or testing. This will be stuck to the camper overhang with VHB or PU (no holes). The styling dept. at Ford made the valance match the width and approximate curvature of the truck cab so it doesn't look too bad. It is plastic so incidental contact with the cab will not be catastrophic. It was cheap and seems durable. Only question now is how far forward/back to mount it. It would be great to be able to experiment with that but I've got no ideas how to hold it in place temporarily to try.

I'll post some pictures when I get it done.