Tou are going to have to devise a jig to hold everything perfectly aligned until the epoxy dries.  That's why the cradles (I hope you didn't lose the CORES, they ARE the wing! ) are so important.  Cores are cut now pretty accurately on the C/L of the blocks so using the cradles and weighting everything down makes alignment a snap. (as usual, you have to have a flat surface to work off of)

MY mistake i ment to say cradles !!!! Man i gotta start wearing a mask when i paint 

I hear ya, Buddy! I knew what you meant.

Maybe you can contact Mike Rogers, he's a Patternmaster guru and should be fairly close to you.  Check with Bobby "MR. '69 NATS" *Champione* Lampione (he's in Flushing) if you can't get up with Mike, 'cause he can.

1) get some 3/4" particle board or plywood from Home Depot
2) rip a 3" wide and 12" wide strip long enough to span both halfs
3) position 12" strip on a flat surface amd shimmy it so that it would lie flat and parallel to the ground. Use a long carpenter's level, at least 3' long.
4) Glue(Thick CA with kicker if you like) 3" strip to the side of the 12" strip at 90 degree angle. Make sure the top of the strip is parallel to  the ground
5) Position halfs so that the trailing edge sits atop of the 3" strip. Weigh it down so it does not move
6) shimmy halfs near the center seam so that the tops align and halfs are pushed up against each other
7) epoxy 1" wide tape along the seam. Let it dry.
flip the cores and repead steps 5 through 7.

Done.

Ditto what Ty says - and...here is my alternate method (primary method is w/cradles).  Dry fit for perfect alignment then join w/ 5 minute epoxy.  Hold the wing panels together while maintaining alignment and make small adjustments as necessary.  You will be surprised how accurate the MK I eyeball can be when challanged.  I'm not saying that this is a better method than the ones previously mentioned nor is it an original idea, but it will work. After joining, reinforce w/fiberglass etc.