Or you could just get a UK spec closed deck...
Jap spec is open deck designed, but it doesn't really matter anyway. Blue monster was and still is running a Jap hollow deck and its still running as far as we know. I would actually be more inclined to go for the hollow deck as I'd be more worried about cooling than cylinder warping (which coincidentally occurs more prevalently under extremely high temperature conditions)
The auto block seems as though its a good compromise of peace of mind and cooling, but I'm not too sure how many galleries there are in the cylinder gussets. If there's only one or two, you may as well use a closed deck then..
Sean