How to resize a selection of vectors by numerically resizing a segment ?

I have a problem with illustrator that i've never been able to resolve (in on cs3 by the way - don't tell me it's something that's only on cs5!)
goes as follows....
i create accurate forms in a 3d modelling package , i export it in either an ai, eps, dxf, dwg file (they all come out the same - tiny in illustrator ) , when i open them in illustrator, then are never to the same scale (even when i try and timker with the import scale settings, they always seem to be off).
my work around is that I usually include a box that's say 100cm square with the forms inside, when i open in illustrator i then draw a new 100cm square by keying into the draw rectangle tool/dialog box, i then line the top left hand corner of this square to the top left corner of the box from the 3d model (which should be 100cm square but always isn't) which i select (including the forms inside), then drag the bottom right corner (with the shift key down to keep x & y scaled correctly) to the bottom right corner of the 100cm square box i drew with the illustrator rectangle tool - this sort of works to scale everything i imported to what seems the correct size, but i feels like i'm winging it a bit! the problem is that i get things lasercut from these illustrator files and i'd like to be more sure that sizes are accurate
so my question is, say i have a hexagon shape which i've imported in from 3d cad program and is the wrong size, is there a way of selecting one side and key in the length i want it to be & it scale the whole hexagon accordingly?
thanks in advance to anyone who can help with this !

To scale in reference to your known-size key object:
Use the Line Tool as a measure device. Refer to the Document Info palette for length of the line (or any other selected path):
Now, isn't all of this completely silly for something supposed to be a "modern" vector-based drawing program? Consider:
When aligning objects, Illustrator's interface provides for your designating one object as the reference ("anchor" or "key") object. (For many years, AI beginners continually asked about how to get this to work, because it was "hidden"; the Interface provided no indication whatsoever of which selected object was the reference.)
Would it not be a refreshing measure of consistency in this program's interface (which doesn't seem to know the meaning of the word) to provide a similar reference-object interface for other transformations?
After decades of requests to be able to simply have this program make accessible the length of a path (what a concept!), Adobe finally responded--by burying it in a stupid grab-bag catch-all palette duct-taped to the interface: the so-called Document Info palette.
Yeah. That's intuitive. Lessee...where would I find the length of this selected path? The Appearance palette? The Attributes palette? The schizophrenic Control Panel? No. The Document Info palette, and even there, only after making two further buried selections from its catch-all flyout menu. Your reward for all that tedium? You can't even select the length value to copy it and use it in a calculation.
JET

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