No, I doubt the pins being that length hurt anything at all. What I meant by the making of it was that in a production environment it's not that cost effective to make one.
I've been looking at doing a hybrid of one of my blocks with a pin type block. I would use some threaded rod though. This is just a long (3 foot) rod that has threads cut on the outside of it. I'd use that instead of the wire. The other good thing is you could maybe tap the bottom plate and screw the rods in with some artic silver epoxy on the threads. This would actually give more surface area contact from the bottom plate to the pins although the arctic silver barrier would probrably negate that. Also because of the threading on the pins you would get about twice the surface area.
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