Mine was originally done using the screw holes but it didn't look very good, IMO. Last year, I had the screw holes filled and the pieces are now basically glued down.
One of my pieces developed a crack somewhere along the line (prior to last years work) but my body guy was able to deal with it.
I wanted to weld up my roof but the cost made me keep the Mooneyes pieces.
I'd say the reason you didn't get any response back in January is you posted in the wrong place. Most of the wagon guys don't look here. I only caught it because I was looking through active messages.