Powerconnect switch stacking

You can certainly interconnect the 3 switch types.  As far as "Stacking" the switches where they work as one single switch with a single management IP that would not be possible.  The 5324 and the 6024 do not "stack" at all.  

You can set up a trunk switchport to allow multiple VLANs to move across the connection.  

You can also set up multiple physical ports to work as a single virtual connection.  This would be called a LAG (Link Aggregation).

Example of LAG configuration:

Console (config)# interface ethernet g5

Console (config-if)# channel-group 1 mode on

I hope this helps

Thanks for the info