David, this stuff can be really frustrating - believe me, I know!
The DXF file I uploaded of the vac box is to scale, so you should be able to import it into your design software & the parts should be the right sizes. Here's the dimension of one item so you can confirm it. Hang in there, it gets easier...or so I'm told.
Speaking about frustration: I believe that allot of this software is amazing in many ways, but some of it (eg: eCabinets & ShopBot Link) seems intentionally difficult to work with. It's impossible for me to believe that anyone could actually be very productive with it. I guess that's where the value of good software really is. I used to work with a company that used good software, but never really appreciated it until now that I can't afford it. Someday perhaps.
