S4048-ON - VLT or Stacking

Hi,

Can you do traditional stacking on S4048-ON switches ? If yes, how many switches can be stacked ?

As I understand you can configure S4048-ON as a VLT Domain. 

I plan to deploy 2x S4048-ON as my Core switch configure as a VLT Domain.

Questions:

1. What switches can I use as my access switch that can be connected to the 2x S4048-ON?

2. Would any switch be ok?

3. I plan to get 11x Power Connect 30xx series switches. Would I be able to use VLT and Port Channels?

Thanks,

Paul