Hi
First of all, there is no difference when running RAP or CAP anymore. It used to be 1 CAP per 4 RAP, but that is gone.
So when 7030 can run 64 AP, you can run 64 CAP or 64 RAP.
At the same time, you can always have 2 (7030) controllers, either in a master-local if you wish or just separated.
There is no problem running on controller with CAP and the other with RAP.
You just have to make profiles so that the correct AP's are terminated on it's own controller.
By just looking at controllers and how many AP's they can terminate, the old 3600 is capable of running 128 AP's.
There are a few nifty features you will not get, but as i don't know what your requirements are, i thought i would at least mention it.
Roar Fossen