Flying LS ruling

[herman pahls]

This subject has been talked about often but I need some clarification.
After flying 40 years with a 3rd class medical I am looking into flying LS.
My believe model 4 Kitfox complies with the rules.
What I am not sure about is the altitude and airspace that LS aircraft and pilots are allowed.
I may be getting student LS confused with "licensed" LS.
I read that 10,000 MSL and 2000 AGL? (a different abbreviation was used and do not remember what it was ) as maximum altitude.
I often cruise my Kitfox at 11,500-12,500 to clear the Cascades.
Also, documented instruction is needed to fly into class B,C and D airspace.
Is this needed since I have been flying C and D airspaces with non LS aircraft and my Kitfox with a transponder.
Thanks
Herman