Tailgate Sill rust

[droftardis]

Hey all, 

So as you'll see from the pictures below, I pretty much need to replace the sills on the tailgate. It's the part when you open the tailgate and it's what the seal would connect to. I checked with a number of sites to see if they do replacement parts, but for this they don't. SO I am thinking that my options would be to take it off, grind it back and replace with 1mm strips. Does anyone have any thoughts or recommendations. 

Pictures

Thanks
 

[silverbullet]

Thats pretty bad rust. The seal fits into a U section pressing all the way round, not an easy repair I should think.

[R0B]

For future reference. 

[multisi]

The seal channel is made by the joining of 2 body panels, Brickwerks have the lower and side panels and crossmember  but it would be a big expensive job to do it using the genuine panels.