Project Lavi

http://www.icas.org/ICAS_ARCHIVE/ICAS1988/ICAS-88-1.6.3.pdf

Israel's old project, Lavi, is development of light weight jet fighter using F404 engine, similar size of FA-50 or F-20. Linked paper presented initial sizing study of Lavi while vid. shows effort of development. 

There was a rumor that effort of Lavi design was delivered to China's J-10; both aircraft have similar planform configuration except size of engine (F404 vs AL31F).