Lofting out is drawing out your full size drawings from scale, so as you can build your boat accurately, lay out your diveline, decklines, sheerlines and bulkheads etc and get them all correct, This is why most boat builders have a loft or at least a clear clean deck area. I too am a boat builder by trade. These days a lot of boat plans already come with full size drawings and templates, therefore saving you the tedious task of lofting out, an example of which is Glenn.l boat plans