Finned 10 inch drums?

I decided to go with 11 inch brakes and have just received my 11 x 2.5 drums from rockauto....they look very tough indeed! Luckily, my existing backing plates (the only brake components that came with the 8 3/4 axle I purchased) were for 2.5 inch drums, so everything fits fine.

Now just cobbling together the brake shoes, mounting hardware etc. and I'll be done.