> just be careful with the amount of detail you add otherwise exporting can become difficult, unless of course you break it down into smaller chunks and work on them...

Yes.

If you apply a name to each component type - like "push buttons". You can show or hide them, which if temporarily hidden, will speed up your modeling work flow.

And when you export your .obj's to render, all you have to do is turn off everything but what you want to concentrate on, and you'll save simple and logical chunks to work with in your rendering program. Plus, you'll be able to vary the amount of tessellation (poly) detail on each component.