I agree Geof. I reckon my shed is cooler and quieter. Even resonant noise inside when I'm running the grinder etc. Also feels warmer in winter but probably not an issue for you in QLD Spookty.
I'm in the process of lining the rest of the shed at the moment. 19mm Yellow tongue flooring is great for lining if a bit heavy to maneuver a sheet by yourself.
If I had all those great trees I'd be reluctant to cut any of them too. I just hope you are better at backing a trailer than me
Cheers