Neil,
>> 1) Can you confirm I can switch between AEP and mLinux ‘flavours’ simply by loading the appropriate image?
Yes you can switch to mLinux by just loading the appropriate image. If you had an mLinux model it is a different story due to what is stored in the EEPROM on an AEP model that has to do with Remote Management. You will lose the ability to do remote management if you switch to the mLinux model.
>> 2) Is there any documentation on meta-mono. I’m comfortable with writing C# under windows but a simple ‘how to get “hello world” running’ app note would save some time.
For this I think you will have to look at the Yocto and OpenEmbedded projects to see if they have anything. I am not aware of anything that Multi-Tech has created.
Jeff