I would recommend you not exceed 10% of the grain bill with Carapils. Are you trying to make a West Flanders Red or a p-Lambic? Either way, you want some unfermentable sugars present for the bacteria to feed on. It looks like you're going al grain on this, so you can make it simple. I would use 3 lbs of pilsener and 2 lbs of flaked wheat with 8-12 oz of Carapils if you like. You can add a couple of pounds of light DME depending on your target starting gravity. The corn sugar isn't really going to help you, in my opinion. Mash high- about 158. Split the hops, 1/2 oz at 60 and 1/2 at 30 minutes to keep IBU's down.
You can save a few bucks by buying Wyeast 3268 or 3273- they contain belgian yeast and pedio and lacto, with some brettanomyces yeast. Unless you are avoiding the Brett for some reason. Brew it, ferment it, and sit back and wait a year. Or two years.