I tried again in OnShape for this reddit question:

See: https://www.reddit.com/r/Fusion360/comments/1jzkesf/how_do_i_take_the_last_steps_combining_it_all/

CADLink: https://cad.onshape.com/documents/a5378e80055e172c2eec778c/w/fe9e8ceb231bf80f94f3cfe5/e/35ac2dfd3385b8846e0fc560?renderMode=0&rightPanel=variableTablePanel&uiState=684cf9e2fd65250803bddeb2