They are not that difficult to get hold of though. They are just not on the commercial market, but that is no bad thing and in no way makes a review invalid. It would be invalid if he had stopped building, but he hasn't - thought that IS why I don't review vintage instruments. When comparing this to other luthier instruments though, they are actually easier to get hold of (my usual luthier now has a waiting list of 6 months). With a Timms - you see them you buy one. If you are slow you miss one. That's just the way it is. He WILL make more though. I missed many. Then decided I had to really go for it - I emailed him, he gave me an indication of when he was putting one up, I made a note, I saw it, I bought it. Simple.
Let me give you another, (not me) real world example. When I bought this very one I mentioned it to a few friends and sent them some phototgraphs as they were interested. Two of those friends in the last 5 weeks have also bought one. One bought a used one and one bought a new one direct from Ken. It's do-able.
To suggest they are in some way 'unavailable' or difficult to get is, frankly just wrong. It's not as easy as walking into Argos and buying one with a credit card, sure... But they ARE available all the same... I know which I would prefer.
Maybe I should stop with luthier built reviews?