Jim H.; I rebuilt a 1920 Ibach about ten tears ago. I just treated it like I would a "normal" instrument. Of course I replaced hammers/knuckles, keybed felt, etc. But as I recall the thingee regulated nicely, played well and sounded very pleasant. I don't know what your budget will be from your customer but I wouldn't worry about any unforseen problems that a 'good' field man can't solve quickly :-) Jim Bryant (FL) P.S. Did you know that in the Manchurian Candidate the assasin was described by his Mother as having "been in the field too long"??
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