I am planning on making a small (approximately 1m x 0.5m x 0.5m) hull for a vehicle, but is effectively a boat hull with no contours just straight (tapered) sides out of glass fibre. I will only be making one model and have limited time, so rather than manufacturing a plug of the intended shape out of polyurethane then using the uni mould system to create the mould for the hull, is it possible to just create the inverse shape of the hull out of polyurethane (or another material) and cover it with (I think) a protective resin and a gel coat. I could then just hand lay up the fibres within this mould, would this be possible?