Log cabins - hints needed!

I never thought I would do a log construction, but life is strange indeed. Can anyone give hints of the best modeling approach? I'm afraid I need line drawing type elevations as well as rendered images. I am thinking of writing a PIO, but I'd rather not as I hope this won't happen again so other techniques are preferable. It is not a huge project - some 350 sqm gross floor area - and I don't need to worry about working drawings as an old-fashioned drawingboard person will be engaged to do th

I often work with older buildings + had been wondering how best to bend VW's neat straight lines to the more organic surfaces I'm looking at. Your wall hole tip Matt is great + I'm sure there are many circumstances I'll be looking at how I can use it. For example here I've used it to create a cornice + angled plinth in a brick wall: I was assuming I'd need to model extrudes + apply them to the wall surface but this is a far more satisfactory method.