Thanks, I'll shoot you a pm.The hard parts of making a structure this way are: Straight stock; straight caul plate; and uniform clamping.
Straight stock is usually handled with a planer after the splices are done.
A straight caul plate may be best done by making a torsion box for assembly of your wings then glue on a plastic or aluminum skin (in one piece) that is longer and wider than the spar.
Uniform clamping is tough to assure unless you use a vacuum press.
Yeah, the whole thing looks like a vacuum press is in your future.
I have a suggestion... I live 8 minutes from Ann Arbor Muni Airport, send me a private message with your contact info. With that, we can meet up, and if I like you, I can bring you to the house and show you how to do the laminating with epoxy and vacuum bagging.
One of the folks on the flybaby group was suggesting Johnsons workbench in Charlotte, mi where they've gotten spars for several planes. If they've got quality spruce, Doug fir, or ash, that removed the price difference of truck shipping and the aircraft spruce premium, probably makes more sense to go with solid.