I'm still working on my little Tooned HWs Beetle custom, taking a break to uncross my eyes. While looking at my wheels options I noticed something that had escaped notice until then.
The rear rivet/post, from the HWs oval window VW that donated the back of the car, came SO CLOSE to the hole in the stock base when the two parts were joined. Not planned, but I'll be keeping an eye on it when I do the final version.
I could probably oval out that hole with a drill bit and force it, but nah...
In my best Maxwell Smart impression - "Missed it by THAT much!"
I think that's a testimony to how accurately you got the roof situated.