What operating system (ArubaOS with controllers, or Instant-based)? How many portals and how many points, and what will the overall topology look like (building a map in Google Earth is most effective)?
Distances with clear line of sight, I would put the max at 250-300m personally but I've tested out to 500m without much issue, but it all depends on how it's used and what traffic they are carrying.
Are you planning on doing client access on the 5Ghz radios with mesh or no? I would recommend NOT to...
As far as RF through walls, it just depends on the walls. You can find plenty of articles on line with different attenuation values but it's best to actually measure your walls for attenuation. You will likely not be able to guarantee indoor coverage from outdoor APs, in my experience, it will always be best effort, even for mesh from indoor APs to outdoor APs.