Hi, Sorry for the lack of updates. My workstation was on the fritz. Here are the dimensions and sheet metal pattern of the old style ash catcher bar. It is a little simplified because the original weber one has fillets and curved cuts. These dimensions should get you very close but I have not had the time to try it myself. I printed out the pattern at proper scale though and laid it over the existing bar and it seems to check out. If there are any machinists, draftsmen, engineers or architects in the audience I apologize in advance for the dimensioning. Not my fault, I promise.
Ash Catcher bar dimensions
Ash Catcher bar sheet metal pattern
I'll have a pdf of the sheet metal pattern up soon. I need to fix it.