D3rutat

1: a beautiful root base develops with the bonsai. Here's what you have to do:
on each repot use a root hook and comb the roots from the trunk towards the end of the roots(inside-out) this will eventually create a nice root spread.Then cut any big roots which don't belong there(ex: roots that are one above other, they are not natural looking) but not too many, about 2 on a healthy tree
Continue with the regular root pruning procedurees

2:i haven't heard of fattening a trunk by pinching.it actuallly slows development.If you want to fatten the trunk let it grow freely for about 2 years and plant it in a large pot.

3: if gnarling means wiring then it's hard to wire on a chinese elm. The development is pinch-and-grow.You can only wire the main branches.it's hard to wire bcos the smaller branches are small and dense

4:i'm not from usa but if i can't find wire i use electricians wire.That's all the help i can give you

5::Liverwort is usually removed by hand or use a set of tweezers.
Fungus means that the pot stays too wet for a long time. You can either change your soil mix or use a fungicide

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Bonsai Club Romania