I'm also thinking about aligning the crates to a fixed grit
I'm sorry, but I don't like this idea at all (the rest, your second last post, sounds great!). Now you have almost total freedom in building, then it would be a Minecraft style of building but with a lot less possibilities.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
