Thanks all of you.
I'm very very injoy this stage building process,I like riser work,tip overlay and limb butt work.
A lot of design image flashed across my mind,.....
Simple and elegant is my gole,but I haven't enough ability to do it everytime.
My clinic office are not big enough to setting more power tools such as bandsaw or bigger power sander,my bow building table is an old TV table,only 2 tools need plug: sander and drill,all they are small size.
I,m not as good as you said,I just solve problem by my hand and make my design thinking come true.