I would be interested in the way you got Coppermine To talk to SMF. Could be very useful for a another project on working on
There's a built-in bridging module in Coppermine. No big deal really, just had to sort out some cookie domain restictions.
So if the gallery and the messageboard resides on the same domain (Eg. offmb.nikkiwebster.dk and gallery.nikkiwebster.dk both shares the domain nikkiwebster.dk) it should be no big deal to make the SMF cookie crossdomain readable, (There's an option somewhere in the SMF admin panel) but if they do NOT share the domain, you'll have some programming to do.

And for the links back and forth between coppermine, and the gallery, I used an option in Coppermine to add a custom link, and edited the SMF theme I use to include the gallery link.