So, the answer is "yes, you didn't understand what I wrote".
If not for your dismissive response I'd explain.
Anyone curious can PM me.
Let's just move on, not get caught up in anything.
It's just that last part that I don't agree with. Fab cost, heat loss, everything else, I'm on the same page as you. I don't get what you mean by "significantly different lengths to avoid arriving at the same time"
