I honestly think the 2500 number is very realistic, I don't see demand being much higher than that for kits. The profit will be made on a spare parts programme lasting 3 or 4 years.
I also don't think they have had to retool that heavily. Cliff Letts stated quite clearly that most of the old moulds were still available. It seems the main part that had to be retooled is the chassis tub.