I have been using ProBond for sheeting now for a while, and here is my technique. Most recently, I used it on the Caliente wings, the Caudron, and the new SuperCaliente wings.

Prep the sheeting and cores like you would with any method. Lay out the skins and run a bead of glue down the middle and around the edges. I then use a .010 mylar scraper/spreader to spread the glue around. Make sure that the skins are thoroughly coated with the glue and then scrape all of it off with the scraper. When you have finished, place the skins in the husks with the cores and weight them down overnight and through the next day.

When you pull them from the husks, the wing should be completely glued. It does not seem to hurt to lay the bare wings (minus husks) on a flat surface for another day to allow them to cure fully.

Some other things I picked up along the way-
Whatever you do, don't spray any water on the skins or cores to aid in adhesion. There is enough moisture in the air and the skins as they are to help the glue along. Adding moisture just results in overfoamed glue and recurrent warps... (don't ask me how I know)
If you use thin skins, especially skins made from 1/32" contest balsa, you may want to put waxed paper on the husks before you put the skins and cores in place. This will prevent you from having to cut the husks off the finished wings.. (again, don't ask me how I know...)
Cut your skins oversized and sand the edges back to the core with a razor plane and t-bar sander. Any glue overrun should be easy to sand off.
You can use ProBond if you intend to do skin hinges. It does hold up.

BTW, the Caliente wing is 3/8" thick at the root and sheeted with 1/32" balsa. It was internally reinforced with glass cloth. I used the method above to skin the wings. During the autopsy after the crash, I found that the wing actually only broke in one place that was 12 inches out from the center section on the right wing. The center section was not touched, and the skins are all still fully bonded to the foam throughout.........

One other thought- I just found out that 3m has changed their formulation of 77 spray. The new formulation apparently contains acetone which will melt foam core wings. If you have a can of the good old stuff, use it sparingly. They do have a non-acetone formula available, but I have not heard of anyone using it.

Tim your plane looks great. I look forward to seing the completed product!