My guess is the quilt at the baby shower would be for a baby's use in a crib which you could quickly do some. If he wants a larger quilt, that's going to go that fast. I'd do one at a time, add up your investment of materials including thread, then add time. 50/50 cut is not a fair exchange. You do it all and he reaps the reward so to speak. Find out what your quilting what they think time spend is worth.