You'd just sew them up again
The stitching can be iffy sometimes but at least the raw materials are solid enough that they can always be repaired if a stitch breaks. With the utra-lightweight materials of the Rotaluxes, I found that when they started peeling or coming apart, they were just too flimsy to repair properly.I'm going to try and do the mod tonght as soon as I've finished adding velcro to another softbox. Should be able to put it up straight after assuming all goes as planned.
In terms of evenness, they're fairly bad unmodified, maybe 2+ stops from centre to edge. An elinchrom deflector alone would probably take a whole stop off that difference. Once they're modified, I'd expect them to be within half a stop all-over based on my other strip-boxes. I may even try modifying it so it's very slightly brighter at the top than the bottom if I have the materials laying around.
I'm most curious to see the mods. My sewing skills absolutely suck! It's funny.. I can cut and drill steel and aluminum but can't sew. How sad is that? 

