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This was my thought too, but thats 100hbd, can't expect him to fund that all at once. Maybe in sequence as they get funded.

This sounds like a reasonable approach to me.

Yes, I was thinking a series of little ones, 10% or 400 each is a little small, why not have increments, like 250, 500, 1000, and 2000, it can accomplish a similar effect through combinations. Start with a more agreeable number like 1000.