Convert wall, slabs, pillars and stuff to one piece of solid

[MartinBlomberg]

Hi,

 

So, a couple of thoughts:

1. If I combine all walls, slabs, pillars and stuff to one piece of combined solid, will this make a lighter file?

2. If so, how do I do this? I want to make one piece of solid made out of all the walls and slabs I've created.

3. Is this even a good idea?

 

I'm making an arena, so there's gonna be a lot of stuff in the final file, so it needs to be lightweight and easy to understand.

 

Thanks!