Like below.
I quickly replicated your tree, however of course the details are a bit different.
Just make sure that someone calls the 0.30 bet so that it's not returned to the BB.
If no one calls a bet then a checkdown will lead all uncalled bets to be returned.
If anyone has called it, then they go to showdown.
In monte carlo mode a checkdown basically means "return all uncalled bets and go to showdown".