I too, will be doing this chore for a large KAOS core I'm sheeting.

First, I match the planks edge to edge to insure a close fit. I then label them on the underside, Rt-a, Rb-b, Lt-a, Lb-b, etc., (right top panel, left bottom panel). Once I have them all matched and ready to assemble, I use a hard perfectly flat surface like a glass table top or a scrap piece of float glass.

I use low tack, (blue) painter's tape and apply strips to the upper sides by holding two planks together at a time until I have the correct number of taped planks for the particular core I'm sheeting. I usually do all 4 sheets for both panels all at the same time.

I then lay the completed skin, taped side down to the glass surface. I apply thin CA at points to tack glue each plank to it's mate until all planks are held secure by both tape and glue. I then wet each seam with water and wick thin CA along the entire joint. I use lead weights to hold each glued seam down several seconds until the CA "sets". Then I move on to the next seam, working my way across the entire skin. Once completed, I remove the tape and have a completed skin. I lightly block sand the entire glued surface as this is the side I will adhere to the foam.

The opposite side usually shows no signs of glue or being bonded in any way and presents a superior surface for glassing, monokote, silk and dope or whatever your final finishing technique may be. I lightly sand prepatory to applying my finish covering.

I prefer to adhere my skins, (both ply and balsa) to the cores using thinned Z-Poxy or 30 min epoxy. Use 90% alcohol-based isopropyl to thin your epoxy! I like a consistancy akin to jello when you first mix it with hot water...thicker than water but thin enough to easily pour.

I pour an amount onto the foam and spread it out gently with a trowl or plastic spreader while the core is nested in it's bottom cradle.
I apply the skin, insure it's centered correctly then flip it over into the opposite nested cradle. I apply the balance of the epoxy to the other side in the same manner; apply the skin and place the nested cradle on top and apply weights to hold it all nice and secure overnight.

I then mix more epoxy, complete the other wing panel and sleep on it. Next day it's trim the excess skins, sand the LE and TE's, apply the necessary woods and sand it all again.

Hope this helps....

Oh yeah, to answer your question: CA to glue the planks edge to edge!

PointMagu

"There I was, flat on my back..."