This is not so hard to build thought there're some subtleties:
1. You need to understand how to build structures crossing the window frame (basket, digging wheel, catcher). It's simple: start drawing inside the window, hold the button and draw outside. You may even move the window outside the desktop to draw the most lengthy primitives.
2. The basket requires some debugging - it's hard to draw it not crossing the funnel and holding all the coconuts in the same time.
3. You need to correctly attach basket to a digging wheel and still it'll requires duplication to make it work.
4. Sometimes coconuts may dissapear: so on simulation restart you see not 15 but less number of coconuts in the funnel (probably bug in physical engine on primitives massive crossing). It's annoying since you need to refresh browser and rebuild everything from scratch (it happened to me twice).