I used to consider myself pretty up on networking design and technology 30 years ago, but my skills have clearly atrophied :(  Thus a series of question that I hope will not annoy too much.

I am installing an outdoor wifi network on a large (50 acre or so) rural site that is quite mountainous and forested.

The site basically has two "halves", separated by a forested gully.

I want to use EAP-225 Outdoor AP's on each half (likely 3-4 on each half), some hardwired to each other and some in Mesh mode, and to connect the two halves using CPE-210's.  I chose 2.4 GhZ for superior penetration of the foliage, and so far that seems to be proving out.  I have verified that the CPE-210's can connect over the roughly 1/4 mile link between the two "halves."

My question is how best to configure the various AP's.  In a perfect world, I would like a single SSID and a single IP namespace across the entire property.

Do I put one CPE in AP mode and the other in client Mode?  I tried that, but it doesn't seem to work :( (where "work" is defined as allowing connectivity across the link - they connect just fine, but the WAN section of the client is blank).

Using the same SSID that I use on my EAP-225's that devices connect to? 

Just assign the same SSID to each EAP-225 and give each one a unique static IP address?

How do I configure the EAP-225's into mesh mode?

Thanks much!