Hello Members,
I need to develop a product, for which the mechanical design is slightly tricky. Till now, I used to do the "Good-Old" Sketch-on-Paper method. But now I feel the need of a 3 modelling software, or something like it.

This software must be able to allow me to decide the PCB size,
Place some bulky components on this PCB,
Help me to enter the dimensions and shape of the PCB, Cabinet, and other components, etc.
If possible allow me to have a 3d view or do a bit of animation, such as movement of the PCB (with components) during assembling-stage of the product.

There is a sea of CAD systems available on the NET. I wonder what method is used by the members on this forum?

Any suggestion(s) ?....
Thank you.