I apologize for not responding sooner - I have been quite busy with school and work. In any event, I appreciate all your feedback.
The contractor is coming by tomorrow morning and I will tell him about my concerns.
Dash, could you please explain a little more what you mean by modifying the filter grill so that it has a V or A shape rail in orther to install two filters? I think I can picture it, but I just want to make sure I konw exactly what you are talking about. Also, the filter area being to small does not mean that the size of the return is insuficient for my system, right?
Again, I thank you for all the feedback. I don't know what I would have done without this website and the good people who contribute all the professional info.