Ever look into the STKinetics CPW submachine gun, the Mexican FX-05 Xiuhcoatl, the Singapore Technologies Kinetics SAR-21?
those would be awesome as well. especially the sar-21.
the type 81 has little to no operation similarity to any ak variant from what I have read on the internet, the gas system is basically a slightly modified sks gas system, its almost an sks-svt hybrid from what I understand.