I managed to do about 10 hours over the weekend, and a further 8 hours over monday and tuesday. I attached everything that needs attaching, then named all objects and organised them into layers. I then went through the layers, methodically, one by one, squeezing more detail out of what I have modeled, optimizing, checking smoothing groups, material ID's, any faces with more than 4 sides. I am now ready for the UVW unwrapping.