<r>Thanks for the reply. I have most certainly made use of ENTER to input exact values -- especially for dimension lines, since I have found no other way to input those values exactly! If I have to change a dimension line to refine a mistaken measurement, I always just delete it so I can type it in ...

<r>Most of the tips and instructions out there seem to assume a house either has perfect 90-degree corners everywhere, or that such an approximation is accurate enough for the intended purpose. However, when I attempted to model my home using all right angles, it simply wasn't close enough for me ...