AusBonsai

G’day all,
I was wondering if I could get some advice on my little Lepto. It’s still very much in development but I was wondering about the branch that moves back to the left. I wonder if that might become a better trunk than the existing one. Any suggestions would be gratefully received.
Thanks

There's a long way to go before this is bonsai so there's likely to be more changes as it develops. It is good to make some early decisions but also be prepared to change as new developments appear.

It is always really difficult to give meaningful advice based just on a couple of 2D photos. We can't see any of the front/back bends or often where branches start and go to but I agree with removing the main trunk. It is tall, relatively straight, few side branches and has no taper. In short, nothing bonsai about it so it should go at some stage.
If you want some more increase in trunk thickness you might consider leaving it intact for a while longer but if you are ready to move forward just cut it now. Consider leaving some as dead wood. Dead branches are a part of many Aussie species. If you decide later that it's not right it is easy to chop then but much harder to put dead wood back if you chop right down straight away.

The lowest branch seems to have some good bends so maybe that's even a possible new trunk line?

Thanks mate, i love how you put things is such good perspective, and it makes a great deal of sense.

Appreciate it