Break the model apart and do them parts by parts.
PUSHER
| PUSHER |
| PUSHER |
| PUSHER |
| PUSHER |
-------------------------------------------------------------------------------------------------------------------------------------------------
THROWER
| THROWER |
| THROWER |
| THROWER |
| THROWER |
| THROWER |
| THROWER |
PULLER
| PULLER |
| PULLER |
| PULLER |
| PULLER |
| PULLER |
| PULLER |