Glad you figured out the snap thing. :-)
For your other questions:
Quote:
Originally Posted by Merrie
1 - I took a box and divided it for the side, would you recommend a better way of doing this or is that fine.
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The way you did it is fine! I usually start with a box for nearly everything.
Quote:
Originally Posted by Merrie
2 - Should I weld the side and top verts? When it is best to do this or not?
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Yes, definitely weld the vertices. Especially for real-time models, you'll get better performance if you weld as many shared vertices as possible. In addition, watch things like T-joints if you can. This can cause texture warping and "sparkling" along the joint. (see image below)
Quote:
Originally Posted by Merrie
3 - When is it best to group?
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Grouping is mostly for your own convenience, unless you're using one of the plugins (such as X-Plane or Poser) that uses the grouping to build an animation hierarchy. I'm not sure what Unity does with grouping, if anything.
Quote:
Originally Posted by Merrie
4 - In order to use in Unity engine I have to use very large sizes such as W 739 H 341 D 863, is there a way to adjust the units so they are not so huge? Or does it matter?
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The units don't really matter. If you go into the AC3D settings panel, you can change the grid size, which helps. Also, the 'f' key will re-focus the camera to whatever you have selected, which is sometimes helpful when you have something very small or very large you are working with. Another tactic if you don't want to change the defaults is model the object at whatever size feels comfortable and scale the whole thing when you're done.