I hope i havn't offended you,My suggestion (if you really want a layout rig) is to watch around your area for a old (snark or one of its copies)beginners type ,sailboat.They can usually be found really cheap,have the decks you want made in,are foam filled so they are practically unsinkable,and have nearly the exact hull shape of a layout boat.Just remove the sailing rigging,add a little higher coaming with a few strips of plywood,cut out the center keel slot and patch its resulting hole with fiberglass,some camo paint and you have a layout boat.They set very low to the water due to hull shape,and can be ballasted to set even lower.The hull shape of a layout is a displacement type,the more you load them the more stable they become. I must warn you though,there are several misconceptions about layouts both heresay and in print.
The first and most inaccurate one is that they are made for rough water ,and that waves just roll off them.THIS IS absolutely 100% NOT TRUE!!!! any breaking type wave of any size will sweep over one from stem to stern , fill and quite possibly drive it under in a heartbeat! they are not made to withstand actual waves,they are made due to their hull shape to ride Swells not breaking waves.
The second is that they are excellent all round duck boats.again not so! they draw too much water to really get back into the shallows where probably 90% or more of the hunting is done in this country,they are nearly impossible to power with anything other than oars,or by sculling.any bird more than a couple of feet above the water will instantly pick it out,and thier large decks are very hard to camo, even in a backwater slough.
They were and are made for one thing only,hunting large rafts of ducks far offshore out of any surf.If this is what you need they are excellent shooting boats.however even when hunting ducks offshore ,a regular boat anchored good in the lee of a rocky ,or high bank for a backdrop.and a large spread of decoys set out of the shade ,will get your fair share of shots when these birds hunt for a lee shore to ride out a storm!. again my humble opinion only,and I apologize if Ive offended you.