Home network setup and flakiness

I bought some gear I’m trying to get setup for a home network, and have been struggling with making everything work with some level of stability.

Attached is a diagram of where I’d like to get:
Screen Shot 2016-02-07 at 11.32.18 AM.png
For now, I can’t even get the basic version of this working, ignoring the DSL modem.

I’d like the RB3011 to do most of the heavy lifting, the Netmetal should be a simply 5Ghz access point (for the time being I’ve given it an SSID with 5Ghz so I can connect to it reliably, but auto switching between it and 2.4 would be nice). Those are both upstairs.

The CRS1098 is downstairs. I’d like it to do switching and be an access point as well.

Eventually, I’d like to configure DSL as a fallback to Cable (much faster, so I don’t want load balancing), and have two Xbox’s go across dedicated internet (one to the cable, one to the DSL) – but for now I’d be happy with internet that works on the desktop/devices and wifi with just the Cable modem.

Is my IP configuration okay? (Setting the AP and Switch to 192.168.88.2 and 192.168.88.3, or what should my DHCP settings be all around.)

When I start configuring things as bridges, they become unreachable. The 3011 is quite stable, and I’m hardwired in, and the internet works. The wireless can be connected to but doesn’t provide internet. I can telnet to the 3011 and then mac-telnet to the netmetal, it connects but kicks me about 2 seconds later. I read stability of connecting to bridges is poor. How are you supposed to configure them?

More generally, how should I go about configuring end-to-end?