Ten 1142N APs and one 2112 Controller MESH Design. Is it possible?

Hi all.
I've came with this question when started wireless design, so will appreciate any help. I want to implement MESH Wireless Design.
There are 3 floor building. One controller connected to one RAP configured AP on each floor by Cat5 cable, so 3 RAPs. Other APs on the floor are configured as MAPs and connected to RAP wirelessly.
The simple diagram:
AP5        AP4         AP3           AP2           RAP1-----Cat5-------Controller 2112 ---Cat5----- DSL Router---Cat5-----Internet
I can't use Cat5 cable to all APs, as there are 3 floor building, with max distances over 300 metres.
The question is:
Can these devices be configured for MESH topology?
I followed that article from cisco website.
Cisco Mesh Access Points, Design and Deployment Guide, Release 7.0.116.0
Is there any other solutions, wirelessly connect controller and 10 APs?
As I thought it can be connected wirelessly, that's a purpose of the controller. But some sellers and technicians say that every AP should be Cat5 connected.
Thanks in advance.

I have a similar situation.  I have to setup a temporary WLAN solution to handle appx. 400 clients for a 1 day event.  I have extremely little time to get this together, such as a couple days, as I said, very impromptu project.  I have a WLC 5508 as well as several 1142n LAPs at my disposal.  I believe the 1142n can operate as a mesh AP correct?  Problem is, where the WLAN and internet is needed, there is no existing infrastructure, I'm aiming to extend our infrastructure there wirelessly.  I plan on deploying the 5508 at our location where we do have some infrastructure, setup 2 LAPs as mesh APs, with the root being at same site as WLC.  Then extend the network via the mesh APs to the new site.  I'll be using a Catalyst 3560-24 PoE at the new site to both power up the APs as well as provide local switching.  Then create a new WLAN/SSID for the new site and enable that for necessary access, intent etc.  
Does this sound as if it would be a feasible solution for a "quick and dirty" temporary wireless solution?  Also, how many LAPs would you recommend to handle appx 400 400 clients?  I believe each of those LAPs can handle appx. 25 clients with a max of 50?  I don't expect 400 clients to be actively using the system, but in attendance.  I just have to ensure that if they opt to connect, they can.  Obviously I want adequate performance, but max performance as far as bandwidth is not necessary here, instead maximum connections.  
If anyone has any suggestions, I certainly welcome them.  Once again, thanks in advance.  If I can help by supplying additional information I'll be happy to.  Thanks again.

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