I've been fantasizing about a new mainsail for a while now. My boat came with a sad triangle from an overseas sweatshop. The original sail was moderate roach, full batten, bolt rope, which keeps the mainsail in shape with minimal intervention. I think the original design has some room for improvement, however. The B&R rig deserves a fat roachy main. My next sail will be modeled after the current Marlow-Hunter 22. Loose foot, fat-head, partial-full batten.
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I would add spreader patches because my boat likes to go downwind with the mainsail flat against the spreaders. Our boats are only rigged for a single reef so make it a deep one.
Really your best outcome will come from writing down what you want and taking your list to a local loft and let them pick out the right fabric for your budget and do the design from measurements. It sucks spending half the value of your boat on good good sails but it sucks even more limping around with a shitty bedsheet. I am saving my pennies and will be putting my order in soon.
-Z