No, to get 11.2, you will need to have a receiver capable of encoding and outputting 11.2. Basically, either you need to have a receiver with 11 channels of amplification (that can be used as the same time, make sure you check that, it's not 11 channels of binding posts, so looking at the back and counting won't give you the answer), or you need to have a receiver with pre-amp outputs for additional channels (which in many ways makes more sense budget wise... that way you do split up the cost over time a bit). You can't add additional receivers to get 11 channels...
The TW6100 (or 3020 here in US) is a very good budget projector and a great starting point for a HT. Personally, I like Elite screens, good balance between price and performance. The Marantz receiver will sound good, but you are limited to 7.1 (and that's not necessarily bad... you really need to have enough room to even use the extra 2 channels from a 5.1... and native is pretty much always 5.1 with everything else extracted...). I bet those speakers do sound good, start off with your front 3, then add a subwoofer, then add surrounds, than add back surrounds (if you even need them...).
Ceiling speakers are a bit of a compromise though, same thing goes for inwall. Mind you, they not going to sounds bad per se, but commonly they do get outperformed by free standing speakers.
"Suddenly the thought struck me, my floor is someone elses ceiling" - Nils Ferlin