I'd go one step further and tell him you're an investor. He'd likely be more inclined to give you a tour if he knows you've got money in the company! We know that they are working toward production, so there's no inside information to be garnered by seeing that what they've already announced is happening.
You should probably tell him exactly who you are and that we want to come up for a few days to check up on our employees and lend a hand until this is operational.
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