Trap advise pls :)

[Saxter]

Hi

I'm going to be making some reflectors and base traps to the basic design used on Jeff Strongs site. Some tweaking though, eg I'll be putting mine on stands.

Anyway the question. How few can I get away with? 2 base traps, 2 high freq? I've attached (I think I have) an outline of the room that I will be using. It doesn't have a bad live sound at the moment (not too live though - plenty of nooks and crannies) but I'm more worried about mixing after tracking. the room is big enough to make the traps into a booth for vocals but I'm really just feeling my way.

Thanks in advance for any tips

Cheers

Sax