how much epoxy would you recommend purchasing to stitch and glue and coat inside and outside of a 10' pram with a 4' beam?

looking for approximate to do coat (or two if recommended), fillets, and wetting out of tape for seams, and 3 box type seats.

1st build so any input will be greatly appreciated. boat will need to be stored outdoors off ground on saw horses, but considering building a bent pvc and tarp shelter, that is why i'm considering epoxy not only exterior but interior as well.