I am looking at building a outdoor mesh to provide free open wireless, the plan is to use two AIR-LAP1242AG mounted inside our building with external antenna's attached to the outside as RAP's, LAP1524SB's will be chained from the RAP's going in two different directions. I will use direction antenna's for the 5GHz backhaul and dipole for the 2.4GHz user network, but with the very last LAP1524SB in each chain will use a dipole for the downstream 5GHz backhaul with a couple of extra LAP1242AG's to provide extra coverage on buildings with the same AP inside and external antenna's.
We will be using a 5508 Controller which also controls our internal wireless of AP 3502i's.
Would this work? and is it a reasonable to use LAP1242's for the RAP's to save dollars? Any advice would be much appreciated.