Just to add my interest to this. If the part can be sourced at the right price then I think I may have to make s purchase...
I'll wait and see how the quotes go though 
Goodmorning.
You have to get one.
The more who want/need it, the merrier and possibly the lower the cost.

Have you found out anything how to get the roof into a shiny/glassy black finish at reasonable cost?
Wrapping should do it don't you think? It's also reversible.