I stand corrected on this year's PRA Manuf. Directory - it appears correct to the extent of the models currently there. There have been times in the past where I've called a "kit" manufacturer only to have them say we're not putting together kits any more. An example was Winner's Circle Engineering with that sexy high profile enclosed machine. The Austrailian Amax models were another, although I'm not sure if the PRA mag ever carried them.
I would think, if the mauf. does not respond to updates - you wouldn't include them. Aren't they paying the publications to be included anyway?
I know some have been left out for whatever reasons in the past - Star Bee for example. Aerocrafters is notoriously in deep lag wrt to current info.
Mike