Thank you Charlie, that's very kind. I freely admit that while I've been blessed with a good eye, the hand sometimes lets me down. And, as an engineer, I have to concede that the concept can be better than the execution. The good thing about ham radio is that there's something to keep us all honest.
I don't have a lot of tools or a very big shack/workshop and I therefore tend to spend a lot of time (perhaps too much) thinking about simplified construction techniques and ways of hiding less than perfect cutouts etc. More than likely someone with your background would just hop in and have the job finished while I'm still thinking. Regardless, the good news is that the PA is going well and, with a bit of decent propagation this southern hemisphere winter, it should help with the 630 m results.
73, Peter.