Hello , I wanted to make some architecture things ( always for skyrim

) and I was wondering where coudl I read about guidelines for creating sets for walls , buildings , towers and whatever other architectural element I may need ... but I want them to be snappable into position and work well one with the other in order to align perfectly ... I need to measure well the lenghts and the dimensions but how do I do that in 3dsmax? are there any tools that allows you to keep under controls the dimensions etc?
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grid is king