EveryCircuit mosfet specs?
you can search online in alldatasheet.com or alltransistors.com

alltransistors.com have almost everything detailed with a very useful function searching similar transistor, yes it does have mosfet spec. 
but i doubt there is lambda and KP spec, i never understand either, because there is only Vds Vgs Id, etc even on the original and official specification there is no Lambda spec

there is explanation better from the other user of everycircuit :
http://everycircuit.com/circuit/5927322113015808/

http://everycircuit.com/circuit/6148524605702144/n-mosfet-lambda-adjustment-in-ec

basically they call it leave it to default setting..