I built the proper versions of the Edgarwits aerofoil air curtains today.
Cutting the GOE222 aluminum extrusion to length. If you were careful you could use just a hacksaw.
Note the proper aerofoil profile.
The drilled and tapped aluminum spuds that fit into the 25mm openings in the extrusion. Buying 25mm (1 inch) bar would make this easier.
The spuds glued into place. I used threadlock - ie an anaerobic adhesive.
Marking out and then cutting the 3mm ABS end plates (same material as my front undertray). This material is easy to 'work' with normal tools.
Folding a flange on the heated ABS. (Could have just used blocks of wood.)
The two finished Edgarwits. Each end plate is different so they all needed to be labelled.
Attaching the bottom end plate of the LH side. Note the rubber seal that fills the gap between the straight flange and the slightly curved bumper.
Inside view of bumper. Washers and Nyloc nuts. Don't want to lose a second pair!