beige solid sheet oops its 0.06inch thick, should be 0.03inch, both sides need to come in by 0.015inch (i.e an equidistant reduction AND IT MUST NOT HAVE A GAP on the brown edging.
My method which is a little laborious is :-
explode, offsetSrf inwards each face 0.015 inch
select both faces , run trim command and go around carefully finding all sides to trim, involved many careful picks.
select all beige and join.
(hiding brown edging during all this)
show brown, run intersect, looks good.
I have 8 to do.
is there a quicker way ?
My effort is in attached, layer named to suit, another untouched one there for someone to try.
as for the stencilling as surfaces that were the beige surfaces trimmed to font then offset Srf0.001 they will have to be offset inwards 0.015 but thats easy, select all and run offsetSrf, my job there ! (not attached)