I'm building one now. I remember when I was learning to fly 12-13 years ago tower telling me it was too advanced and never got around to building one.

I pre-glued the balsa sheets together with wood glue and sanded, cut sheets like the book says, lay wax paper on the foam sheaths, spread ProBond Polyurethene Glue on the sheets with a putty spreader with little notches in it on that appropriate side of balsa. Find a level spot on a building table or hard surface. Lay the bottom foam sheath down>wax paper>balsa >core>balsa>wax>middle foam sheath>wax>balsa>core>balsa>wax> top foam sheath. I used a empty fish tank I had to lay on the top to weigh down ( its all I had big and level enough to lay on top).

Note: as I was laying down the cores and sheets I put a few t-pins around it to hold all together so it all wouldnt slide around.