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What are the legalities of doing this with regards the Lego company? Do you have to pay them any royalties / commission?

A material I call “Sement”. I won’t elaborate.

If this is viable, aren't you concerned it will cause NASA et al to favour male astronauts, which will go against equality legislation? :)

More seriously - nice ideas, but how viable is all this in terms of the quantities you could produce vs the quantities required to make anything useful that requires concrete?

I've just finished reading Herman Wouk's history/novels of WW2 and it's still haunting me... do you feel the world has forgotten the lessons it should have learnt after that war?

IDK about him (obviously) but I simply use Outlook, and at the end of December every year create a new .pst file for the next year's emails, and can rerference any of the previous year's emails now simply by laoding that year's .pst archive. I have them going back about 15 years now.

How do/did you sort out visa requirements in advance? Some countries have time-limited visas (so you need to be very strict with your timetable to keep to them) and others only give them out in your home country - those that require both make life very difficult for such a long journey.