Over the past year I've been wanting to do this build. Maybe I'll have a go at it this year after I've got a car.
I drew it out to see what it should look like after I've done all the work to it.
Base gun is the HFC C96 rifle, my plans for the rifle is to chop down the outer barrel, thread the remaining barrel to attach a silencer, cut down the top receiver to align with the front of the ejection port, JB weld a rail to the receiver and somehow upgrade the barrel / hop up as I don't think the range or accuracy will be very good out of the box.
Should be a funky little marksman rifle when completed. If I ever end up starting the project I'll keep this thread updated.