This is really really promising, plays like the classic peak tycoon game Lumber Tycoon
There are a few things that should be added / changed
Mostly make the placing droppers, conveyors or anything on the plot less jank by making it be very clear to the user that he can lock things, maybe making the model be a bit white or have a different border
Also something to make it clear how far the user is into destroying something, adding this makes it a bit more intuitive for new players
Adding a grid option for placing things on a plot would be probably the best addition
Another thing i would add is a rotate button, that would let you rotate anything you are holding in your hands
Other then that, this is very fun for people who enjoy tycoons, play it