Inserting a rectangular face

[Fonte Boa]

<< And were do I place or draw a face in Wings3D? Al I can place are objects. >>

Put an initial primitive,
manipulate it if you want, then
select the appropriated face(s)
Use Face | Extract | Normal
to begin the creation of a double-side object without thickness.

if the selection isnt plane
you will have to build a good topology
(Vert | Connect; Tools | Connect; Edge | Cut + Vert | Connect)
starting with the big resultant face (one of the object "sides").

if the selection is flat plane,
select that big resultant face and
call Tools | Virtual Mirror | Create,
and then Tools | Virtual Mirror | Freeze

my 2ç