Case in point:
Today, in order to get this:
I had to measure, with the same precision as the drawing (1/32") thusly:
(I use an Incra Rule and .05 Incra pencil lead when laying out to facilitate this)
What it boils down to ... when you work from a precision drawing (Sketchup's precision, IIRC, is the same as AutoCad: 0.000001), you do yourself a big favor by trusting your model and using the actual dimensions of the drawing to the best of your ability.
This will guarantee you that, if you take care in measurements and use the same resolution, you can accurately fabricate that model in real life, no matter how many you have to scale to fit a space.
This may not seem like much, but put 12 cabinets side by side and expect everything to line up with precision and work out without a hitch, _in a space that did not even exist when you built the cabinets_ , you gotta learn to trust your tools. :)
Even more important when you work with someone else and they use the same methods and sense of meticulous precision, but work in another location.
Example: Leon built this cabinet, on less than 24 hours notice, in his shop, and from a drawing, and it fit in between two already installed components _precisely_ the next morning, I do mean precisely:
From this:
(and yes, we calibrated/checked our table saw fence rulers about six years ago)
And, I'm still impressed that by that feat ... :)