That sounds pretty good.

Make sure that your foam surface is airtight and a couple of inches oversized.

Make the bag oversized - better than too small! Wrinkles in that won't matter. get the peel-ply nice and flat tho'

Put plenty of resin on the foam 1st. Any excess will always get drawn through, but less likely to go the other way if foam is abit dry

make sure that foam is secured in shape well as distortion may happen under pressure [As previouly said]

take a look at the farrier builders, many of them do it this way. Myself,seeing as Farriers only use one skin of glass, i didn't find it worth the effort/money. You can't beat a good man on the squeegee that is also paying for the resin! Always use peel-ply tho.