I've just started using C8Pro and I'm having trouble using the grid in the spline modeler.  I need to draw a large model - 15ft long - but with accuracy down to the inch.  I tried adjusting the grid down to one inch increments, but when I zoom in to work on the details, the grid sets to a different measurement.  How do I zoom in, but retain the new grid measurements?

Any help will be greatly appreciated.  Thanks in advanced.

I set my modeling box to 20 feet, then I set the grid to spacing 1 every .13  That's about as accurate as you can get it.  I just wish the stupid thing wouldn't keep resetting.

It is for reasons like this that I eirther use the vertex modeller or turn to my external modeller  "Hexagon"

Nah.  I stink with the vertex modeler.  I never could quite get the hang of it.  With a little creativity you can do almost anything in spline models that you could do in the vertex room.  I really need to figure it out though.

Well if you get stuck and you need an extra pair of hands for a project just ask. Otherwise, just keep practising and you will get there.

Half my issue is that the manual for Carrara is not very useful.  It only described things in a very general way and there is not much actually useful specific info.  I taught myself the rest of the program, but the vertex room just confuses me too easy lol.

I got myself up to date with carrara by using the "Carrara 5 pro handbook" by "Mike De La Flor". Though it was written for version 5 it can still be applied to the latest versions and actually helps to clear up some everlasting questions and reveals a few hidden secrets too. Once I had read the manual and completed the tutorials it was just a case of expanding what I had learned using the carrara help file, though I have to agree with you and say that it is lacking in true structure for the beginner etc.

 Carrara's spline modeler is not designed for precision. When I need absolute accuracy, I'll create the shapes in illustrator and then import them into the Spline Modeler instead. This a great way to leverage the many drawing capabilities of Illustrator to make some complex shapes that would be near impossible to do well in Carrara alone. 

I wish I had Illustrator.  I spent my yearly 3D budget on C8 Pro this year LOL.  When I run into a complex shape, I generally break it down into manageable components, and model each element separately.  But you are definitely right about precision.  It requires a lot of tweaks and fussing to get parts to fit in with each other properly.  I really need to learn the vertex room.  And I definitely need to learn proper UV Mapping...  I really stink at that as well.  I'm pretty much self taught since Ray Dream, so I am probably quite a bit behind the curve on some elements.