Turns out the config is at least a very large part (or updated?).
Please, for a lot of reasons, only use a single bridge and add VLAN’s.
The latter can be best setup by reading this great article/topic:
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Once you have configured it correct, you will love the clarity of using VLAN’s!