How many inserts do you have and what are they?
Invitation (obviously)
RSVP (where does the envelope for this go - behind the RSVP card?
Accommodations (???)
Reception Info (????)
With the exception of the invite, do you have the inserts labeled somehow (with a header row or something) or is the text on each piece self-explanatory.
I'm thinking this style may be more complicated than it's worth.
If you want to post pix, I'd love to see them.