Have seen in the past a device that you can put a circular saw onto so it becomes a mitre/table saw, anyone any idea where they come from.
Search for "Triton" - they do a table that accepts various power tools (circular saw/router etc),as you describe.
heeelllooo Sink/HWB Wastes wolfcraft [machine mart]do a table with wheels that takes routers circ saws jigsaws and drills for around a ton theres 3 choices of multi table [i have the 1000]i use for my big router just do a serch for "wolfcraft" big all